- #1 The Bureau: XCOM Declassified
97% matchMostly Positive70% of 11,991 reviews2013
Dev: 2K MarinPub: 2K
Windows · Mac
Median: 3.2 hrsMean: 14.6 hrs≥1hr: 86%
The year is 1962 and the Cold War has the nation gripped by fear. A top-secret government unit called The Bureau begins investigating a series of mysterious attacks by an enemy more powerful than communism.
Why similar: Third-Person Shooter 38.2%, Sci-fi 16.8%, Aliens 10.9%, Shooter 9.6%, Action 9.6%
Why You'll Like It: This is the most direct thematic relative, offering a third-person tactical shooter experience set within the XCOM universe.
- #2 EARTH DEFENSE FORCE 5
96% matchVery Positive94% of 11,300 reviews2019
Dev: SANDLOTPub: D3PUBLISHER
Windows
Median: 14.1 hrsMean: 41.4 hrs≥1hr: 93%
Stand and fight for humanity. This arcade shooter takes place in the year 2022, as the Earth Defense Force fends off an all-out attack by unknown life forms. Become an EDF soldier, battle against endless hordes of immense enemies, and restore peace to the earth.
Why similar: Third-Person Shooter 37.8%, Shooter 16.3%, Aliens 15.8%, Action 14.9%, Sci-fi 12.4%
Why You'll Like It: This is the definitive arcade-style alien-slaying experience that mirrors the frantic, over-the-top action found in Enforcer.
- #3 EARTH DEFENSE FORCE 4.1 The Shadow of New Despair
96% matchVery Positive95% of 10,351 reviews2016
Dev: SANDLOTPub: D3PUBLISHER
Windows
Median: 4.9 hrsMean: 21.2 hrs≥1hr: 89%
It's a fight for the future of the planet between the Ravagers, a merciless swarm of alien invaders, and the Earth Defense Force (EDF) in this third-person shooter.Play as four different classes in over 80 missions with a range of 800 weapons at your disposal.Co-op play supported.
Why similar: Third-Person Shooter 47.9%, Aliens 17.2%, Sci-fi 12.9%, Action 11.4%, Shooter 10.6%
Why You'll Like It: It offers the same core loop of defending Earth from massive insectoid alien swarms using an arsenal of futuristic weaponry.
- #4 Aliens: Fireteam Elite
95% matchMostly Positive80% of 26,362 reviews2021
Dev: Cold Iron Studios
Windows
Median: 4.7 hrsMean: 17.8 hrs≥1hr: 87%
Aliens: Fireteam Elite is a cooperative third-person survival game set in the iconic Alien Universe. Battle through hordes of different types of Xenomorph, customize your character and gear, and level-up as you try to contain this ever-growing threat.
Why similar: Third-Person Shooter 35.8%, Shooter 20.3%, Aliens 18.1%, Sci-fi 13.7%, Action 6.8%
Why You'll Like It: A high-intensity third-person shooter that focuses on squad-based combat against waves of extraterrestrial threats.
- #5 Serious Sam 4
94% matchVery Positive83% of 17,240 reviews2020
Dev: CroteamPub: Devolver Digital
Windows
Median: 7.2 hrsMean: 15.9 hrs≥1hr: 90%
Serious Sam 4 reignites the classic FPS series in a high-powered prequel loaded with an explosive arsenal, intergalactic carnage, and perfectly timed one-liners.
Why similar: Shooter 51.5%, Action 25.4%, Third-Person Shooter 23.1%
Why You'll Like It: It captures the pure, arcade-shooter energy of Enforcer by pitting the player against overwhelming hordes of alien enemies.
- #6 Binary Domain
94% matchVery Positive86% of 8,057 reviews2012
Dev: Devil's DetailsPub: SEGA
Windows
Median: 1.6 hrsMean: 10.4 hrs≥1hr: 56%
Set in futuristic Tokyo, take control of the robotic community before they control everything!
Why similar: Third-Person Shooter 53.7%, Sci-fi 18.2%, Shooter 12.4%, Action 10.4%, Third Person 5.3%
Why You'll Like It: A squad-based third-person shooter that features intense sci-fi combat and a focus on destroying robotic and alien-like threats.
- #7 Lost Planet™: Extreme Condition
93% matchVery Positive81% of 2,142 reviews2007
Dev: CAPCOM Co., Ltd.Pub: Capcom
Windows
Median: 1.4 hrsMean: 6.3 hrs≥1hr: 57%
Driven to the brink of extinction on ice-covered wastelands, humankind fights to survive. Battle to survive against gargantuan alien Akrid and treacherous Snow Pirates on the vast and frozen landscape of EDN III.
Why similar: Third-Person Shooter 50.7%, Sci-fi 19%, Action 15.6%, Shooter 10.5%, Third Person 4.2%
Why You'll Like It: This sci-fi third-person shooter emphasizes fast movement and combat against massive alien creatures in hostile environments.
- #8 XCOM® 2
91% matchVery Positive85% of 107,051 reviews2016
Dev: Firaxis GamesPub: 2K
Windows · Mac · Linux
Median: 12.6 hrsMean: 61.0 hrs≥1hr: 90%
XCOM 2 is the sequel to XCOM: Enemy Unknown, the 2012 award-winning strategy game of the year. Earth has changed and is now under alien rule. Facing impossible odds you must rebuild XCOM, and ignite a global resistance to reclaim our world and save humanity.
Why similar: Strategy 52.7%, Sci-fi 47.3%
Why You'll Like It: While turn-based, it is the essential modern experience for anyone interested in the core XCOM alien-invasion narrative.
- #9 Evolva
92% matchVery Positive92% of 52 reviews2018
Dev: Computer ArtworksPub: Interplay
Windows
Evolva combines the excitement of a fast paced shoot-em-up with the tactical challenge of commanding a squad. Fight against the alien parasites and save the planet. This is survival of the fittest!
Why similar: Third-Person Shooter 32%, Strategy 16%, Shooter 14.4%, Aliens 12.6%, Sci-fi 11.8%
Why You'll Like It: This game shares the mutation and alien-focused action themes that define the core gameplay of Enforcer.
- #10 Warhammer 40,000: Space Marine - Anniversary Edition
91% matchVery Positive92% of 32,510 reviews2011
Dev: Relic Entertainment
Windows
Median: 5.1 hrsMean: 18.1 hrs≥1hr: 87%
In Warhammer 40,000 Space Marine you are Captain Titus, a Space Marine of the Ultramarines chapter and a seasoned veteran of countless battles.
Why similar: Third-Person Shooter 51.8%, Sci-fi 16.9%, Shooter 12.7%, Action 11.1%, Third Person 7.5%
Why You'll Like It: It delivers the same feeling of being an unstoppable force of destruction against endless waves of alien enemies.
- #11 Destroy All Humans!
89% matchVery Positive92% of 11,296 reviews2020
Dev: Black Forest GamesPub: THQ Nordic
Windows
Median: 4.0 hrsMean: 6.8 hrs≥1hr: 84%
The cult-classic returns! Terrorize the people of 1950's Earth in the role of the evil alien Crypto-137. Harvest their DNA and bring down the US government in the faithful remake of the legendary alien invasion action adventure. Annihilate puny humans using an assortment of alien weaponry and psychic abilities.
Why similar: Third-Person Shooter 32.5%, Aliens 25.3%, Action 17.9%, Sci-fi 16.7%, Third Person 7.5%
Why You'll Like It: It provides a satirical, action-heavy take on the alien invasion genre that shares the arcade-like spirit of Enforcer.
- #12 Red Faction®: Armageddon™
90% matchMostly Positive73% of 4,953 reviews2011
Dev: VolitionPub: Deep Silver
Windows
Median: 2.0 hrsMean: 7.8 hrs≥1hr: 64%
Red Faction: Armageddon Path to War includes 4 new missions, 2 unlockable items and 10 new achievements!
Why similar: Third-Person Shooter 36.4%, Sci-fi 16.1%, Shooter 16.1%, Action 11.9%, Aliens 11.2%
Why You'll Like It: A third-person sci-fi shooter that features heavy environmental destruction and combat against alien infestations.
- #13 Earth Defense Force: Insect Armageddon
89% matchVery Positive87% of 1,131 reviews2011
Dev: Vicious Cycle Software, Inc.Pub: D3Publisher of America, Inc.
Windows
Median: 2.6 hrsMean: 8.5 hrs≥1hr: 67%
Thousands of giant insects and aliens once again ravage the earth, and only the Earth Defense Force can stop them.
Why similar: Third-Person Shooter 61.1%, Action 14.6%, Sci-fi 9.1%, Aliens 6.7%, Shooter 5.5%
Why You'll Like It: A more streamlined, arcade-focused entry in the EDF series that aligns closely with the pick-up-and-play nature of Enforcer.
- #14 Quake 4
88% matchVery Positive88% of 3,762 reviews2011
Dev: RavenSoftPub: Bethesda Softworks
Windows
Median: 1.8 hrsMean: 6.7 hrs≥1hr: 58%
As part of the elite Rhino Squad, you must spearhead Earth’s military invasion of a hostile alien homeworld. But, in this desperate war for humanity’s survival against an unrelenting enemy, you may discover that the only way to defeat them...is to become one of them.
Why similar: Shooter 40.5%, Sci-fi 32.2%, Action 18.9%, Aliens 8.4%
Why You'll Like It: A classic sci-fi shooter that focuses on fast-paced, visceral combat against alien invaders.
- #15 Xenonauts
87% matchVery Positive87% of 5,012 reviews2014
Dev: Goldhawk Interactive
Windows · Mac · Linux
Median: 8.2 hrsMean: 19.7 hrs≥1hr: 88%
Xenonauts is a strategy game in which you control a multi-national military organisation defending a Cold War-era Earth from alien invasion, using small squads of persistent soldiers to eliminate the extraterrestrials and recover their technology in turn-based ground combat.
Why similar: Strategy 37.4%, Aliens 34.3%, Sci-fi 28.3%
Why You'll Like It: A classic-style strategy game that captures the original spirit of the X-COM series' struggle against extraterrestrials.
- #16 Alien Swarm: Reactive Drop
86% matchVery Positive95% of 23,448 reviews2017
Dev: Reactive Drop Team
Windows
Median: 1.7 hrsMean: 9.9 hrs≥1hr: 63%
Co-operative top-down shooter game available for free. An epic bug hunt featuring a unique blend of co-op play and squad-level tactics.
Why similar: Third-Person Shooter 38.9%, Shooter 19%, Aliens 18.2%, Sci-fi 15.3%, Third Person 8.5%
Why You'll Like It: While top-down, it perfectly captures the frantic, co-op tactical action of fighting off alien swarms in a sci-fi setting.
- #17 XCOM: Enemy Unknown
85% matchVery Positive93% of 57,975 reviews2012
Dev: Firaxis GamesPub: 2K
Windows · Linux
Median: 10.8 hrsMean: 35.0 hrs≥1hr: 93%
The XCOM: Enemy Unknown - Slingshot Pack is Now Available!
Why similar: Strategy 37%, Sci-fi 32.5%, Aliens 28.1%, Action 2.5%
Why You'll Like It: The definitive strategic foundation for the modern XCOM franchise, providing the context for the alien threat.
- #18 Dark Sector
86% matchMostly Positive75% of 3,387 reviews2009
Dev: Digital Extremes
Windows
Median: 42 minMean: 6.0 hrs≥1hr: 43%
A third-person Action/Shooter that thrusts players into a sci-fi flavored nightmare scenario set in the post Cold War era.
Why similar: Third-Person Shooter 52.8%, Shooter 17.1%, Action 13.3%, Sci-fi 9.5%, Third Person 7.3%
Why You'll Like It: A third-person shooter that features unique combat mechanics and a gritty sci-fi atmosphere similar to early 2000s action games.
- #19 Remnant: From the Ashes
84% matchVery Positive84% of 56,041 reviews2019
Dev: Gunfire GamesPub: Arc Games
Windows
Median: 11.6 hrsMean: 28.5 hrs≥1hr: 94%
The world has been thrown into chaos by an ancient evil from another dimension. As one of the last remnants of humanity, you must set out alone or alongside up to two other survivors to face down hordes of deadly enemies to try to carve a foothold, rebuild, and retake what was lost.
Why similar: Third-Person Shooter 61.8%, Shooter 23.5%, Action 14.7%
Why You'll Like It: A third-person shooter that emphasizes challenging combat against bizarre alien entities in a post-apocalyptic setting.
- #20 HELLDIVERS™ Dive Harder Edition
82% matchVery Positive90% of 32,984 reviews2015
Dev: Arrowhead Game StudiosPub: PlayStation Publishing LLC
Windows
Median: 4.7 hrsMean: 20.7 hrs≥1hr: 80%
HELLDIVERS™ is a hardcore, cooperative, twin stick shooter. As part of the elite unit called the HELLDIVERS, players must work together to protect SUPER EARTH and defeat the enemies of mankind in an intense intergalactic war.
Why similar: Sci-fi 32.4%, Shooter 31.5%, Strategy 18.2%, Action 17.9%
Why You'll Like It: It emphasizes chaotic, mission-based alien eradication that feels like a spiritual successor to the arcade intensity of Enforcer.
- #21 Fortified
83% matchMostly Positive74% of 1,720 reviews2016
Dev: Siege Camp
Windows
Median: 3.2 hrsMean: 4.9 hrs≥1hr: 89%
Fortified is an explosive strategy shooter where players will defend the Earth against a menacing Martian invasion in the 1950s. Play as one-of-four pulp inspired heroes as they fight swarms of terrifying robots with an arsenal of Cold War era weapons and experimental technology.
Why similar: Action 69.7%, Third-Person Shooter 11.6%, Strategy 7.6%, Aliens 4.8%, Sci-fi 3.1%
Why You'll Like It: A hybrid of tower defense and third-person shooting that requires tactical placement and active combat against aliens.
- #22 Freedom Force
84% matchMixed56% of 538 reviews2009
Dev: Irrational GamesPub: 2K
Windows
Median: 24 minMean: 3.0 hrs≥1hr: 30%
From a distant corner of the galaxy, an evil alien race sets in motion a sinister plan to conquer the Earth. They unleash a powerful catalyst — Energy X — that imbues the planet's worst miscreants with super-powers to bring the planet to its knees. Now Earth's only hope lies with a new breed of heroes... The Freedom Force!
Why similar: Strategy 100%
Why You'll Like It: An action-oriented tactical game that shares the retro-futuristic aesthetic and mission-based structure of Enforcer.
- #23 XCOM®: Chimera Squad
80% matchMostly Positive71% of 23,227 reviews2020
Dev: Firaxis GamesPub: 2K
Windows
Median: 7.2 hrsMean: 17.1 hrs≥1hr: 79%
XCOM: Chimera Squad delivers an all-new story and turn-based tactical combat experience in the XCOM universe.
Why similar: Strategy 56.4%, Aliens 25.3%, Sci-fi 18.4%
Why You'll Like It: A smaller-scale, more action-oriented tactical game that focuses on elite squad operations.
- #24 UFO: Aftershock
82% matchMostly Positive75% of 252 reviews2014
Dev: ALTAR InteractivePub: Fulqrum Publishing
Windows
Median: 18 minMean: 27.9 hrs≥1hr: 39%
UFO: Aftershock is a combination of tactical squad combat and global strategy that enhances and expands upon its prequel, UFO: Aftermath.
Why similar: Strategy 62.4%, Sci-fi 19.9%, Aliens 17.8%
Why You'll Like It: A direct follow-up that expands on the tactical combat and base-management aspects of the alien-invasion genre.
- #25 Anomaly Defenders
81% matchMostly Positive77% of 676 reviews2014
Dev: 11 bit studios
Windows · Mac · Linux
Median: 3.2 hrsMean: 5.7 hrs≥1hr: 89%
Anomaly Defenders is the closing installment of the Anomaly series. The original incarnation of the Tower Offense sub-genre had players controlling humans fighting alien invaders. Now, the tables have turned. The human counterattack is underway and the alien homeworld is under threat.
Why similar: Strategy 67%, Action 21.4%, Sci-fi 11.6%
Why You'll Like It: A tower defense game that flips the script, allowing you to defend against human invaders from an alien perspective.
- #26 UFO: Afterlight
81% matchMixed65% of 531 reviews2014
Dev: Altar GamesPub: Bohemia Interactive
Windows
Median: 12 minMean: 9.4 hrs≥1hr: 28%
The story is situated on Mars. It starts where UFO: Aftermath left off and runs simultaneously with UFO: Aftershock. While the Laputans on Earth are fighting Wargots and Starghosts and finding out what caused the destruction of their home planet, a small colony on Mars is trying to survive and flourish.
Why similar: Strategy 55.6%, Sci-fi 24.2%, Aliens 20.3%
Why You'll Like It: This entry shifts the focus to Mars, maintaining the tactical sci-fi combat against alien forces.
- #27 Xeno Command
78% matchVery Positive84% of 55 reviews2022
Dev: ChillyRoomPub: ChillyRoom
Windows
Defend galaxy against Alien invasion in the RTS offline game with roguelike fun
Why similar: Strategy 42.7%, Aliens 29.9%, Sci-fi 27.4%
Why You'll Like It: An action-RTS that blends base-building and combat, capturing the feel of managing an alien-fighting force.
- #28 Aliens: Dark Descent
75% matchVery Positive88% of 17,771 reviews2023
Dev: Tindalos InteractivePub: Focus Entertainment
Windows
Median: 4.2 hrsMean: 14.9 hrs≥1hr: 87%
Drop into the gripping journey of Aliens: Dark Descent, a squad-based, single-player action game in the iconic Alien franchise. Lead your soldiers in real-time to stop a new and terrifying kind of Xenomorph outbreak on Planet Lethe.
Why similar: Strategy 41.3%, Sci-fi 24%, Aliens 21.3%, Action 13.4%
- #29 2023: Alien Bugs Invade Earth
78% matchMostly Positive77% of 53 reviews2023
Dev: StarTroop LLC
Windows
Why are alien insectoids invading Earth in 2023? This narrative driven 2D shooter pits you against a seemingly hopeless battle against the invading Insectoids. How will you (and Earth) manage to survive? What hidden technological, historical, and spiritual secrets will you discover as a result?
Why similar: Aliens 34.4%, Sci-fi 28.6%, Shooter 25.4%, Action 11.7%
Why You'll Like It: A straightforward title that leans into the B-movie alien invasion aesthetic shared by Enforcer.
- #30 Strain Tactics
79% matchVery Positive85% of 239 reviews2017
Dev: Touch Dimensions Interactive
Windows
Median: 3.0 hrsMean: 10.3 hrs≥1hr: 63%
Strain Tactics is a real-time-with-pause tactical game, where you command a squad of soldiers to liberate earth from an alien infestation. Using your helibase, deploy your custom squad and provide air support. Remember to keep your crew sane and motivated while staying clear of alien contamination!
Why similar: Strategy 43.5%, Aliens 21%, Sci-fi 18.6%, Action 16.8%
Why You'll Like It: A real-time tactical game that focuses on managing a squad against alien infestations with a high degree of intensity.
- #31 UFO: Aftermath
79% matchMostly Positive78% of 333 reviews2014
Dev: Altar InteractivePub: Fulqrum Publishing
Windows
Median: 54 minMean: 10.0 hrs≥1hr: 47%
UFO: Aftermath is a 3D isometric, tactical strategy game with a rich and compelling sci fi story.
Why similar: Strategy 62.5%, Aliens 20.3%, Sci-fi 17.1%
Why You'll Like It: A tactical strategy game that explores the immediate aftermath of an alien invasion on Earth.
- #32 Future War Tactics: SOF vs Alien Invasion – Turn-Based Strategy
75% matchMostly Positive70% of 136 reviews2025
Dev: QuadCom InteractivePub: Brightika, Inc.
Windows
Future War Tactics: SOF vs Alien Invasion - a turn-based strategy where you command SOF forces against an alien threat. Investigate disappearances, fight the invaders, and uncover the mystery. Every decision affects the fate of humanity.
Why similar: Strategy 49.7%, Aliens 29%, Third Person 21.3%
- #33 Earth vs Mars
74% matchVery Positive88% of 73 reviews2025
Dev: Relic EntertainmentPub: Relic Labs
Windows
Faced with a terrifying Martian invasion, you must lead Earth’s forces in a battle for our planet’s future. Create powerful human-creature super soldiers to fight an alien menace in this turn-based strategy game.
Why similar: Aliens 58%, Strategy 42%
- #34 X-COM: UFO Defense
76% matchVery Positive95% of 3,930 reviews2008
Dev: MicroProse Software, IncPub: 2K
Windows
Median: 6 minMean: 6.8 hrs≥1hr: 24%
You are in control of X-COM: an organization formed by the world's governments to fight the ever-increasing alien menace.
Why similar: Strategy 46.5%, Aliens 27.7%, Sci-fi 25.7%
- #35 X-COM: Apocalypse
77% matchVery Positive89% of 934 reviews2008
Dev: MicroProse Software, IncPub: 2K
Windows
Median: 6 minMean: 17.9 hrs≥1hr: 28%
There's something evil in the city tonight... Earth has been ravaged by human excess, petty conflict and alien invasion. The world's population has been herded into huge cities, the first of which was Mega Primus. 2084: A Utopia shattered, social collapse and civil unrest reigns in Mega Primus. Fiendish aliens terrorize the city.
Why similar: Strategy 48.8%, Sci-fi 25.7%, Aliens 25.5%
- #36 Xenonauts 2
73% matchMostly Positive80% of 3,657 reviews2023
Dev: Goldhawk InteractivePub: Hooded Horse
Windows
Median: 5.7 hrsMean: 19.3 hrs≥1hr: 82%
Wage a global war of resistance against an alien invasion. Command turn-based tactical battles, build a network of covert bases, directly control your fighter wings, and achieve strategic victory in a simulation of asymmetric warfare against a technologically superior foe.
Why similar: Strategy 54.3%, Sci-fi 45.7%
- #37 X-COM: Terror From the Deep
76% matchVery Positive91% of 914 reviews2007
Dev: MicroProse Software, IncPub: 2K
Windows
Median: 12 minMean: 10.5 hrs≥1hr: 29%
The war continues... X-COM: UFO Defense brought you to a galactic battlefield. X-COM: Terror from the Deep brings the alien terror into a totally new dimension.Seeking to take advantage of a weakened Earth, X-COM's deep space foes unexpectedly change strategy and launch a powerful second front against planet Earth.
Why similar: Strategy 47.9%, Sci-fi 26.5%, Aliens 25.6%
- #38 X-COM: Interceptor
77% matchMixed56% of 219 reviews2008
Dev: MicroProse Software, IncPub: 2K
Windows
Median: 6 minMean: 10.0 hrs≥1hr: 22%
They're back...only this time the heinous aliens are out to destroy Earth and rule the new frontier. As X-COM commander, it's your sole duty to protect humanity and the prized mining operations in outer space.
Why similar: Strategy 66.5%, Sci-fi 33.5%
- #39 EARTH DEFENSE FORCE 6
72% matchMixed69% of 6,934 reviews2024
Dev: SANDLOTPub: D3PUBLISHER
Windows
Median: 28.8 hrsMean: 55.3 hrs≥1hr: 95%
Live the future of despair.The year is 2024 AD. The survivors fought against the remaining threats while trying their best to continue their recovery.Three years passed in the year 2027. In a new world without hope, the time has come to once again resist the fate of the Earth.
Why similar: Third-Person Shooter 50.3%, Shooter 21.9%, Sci-fi 15.6%, Action 12.3%
- #40 Alien Death Mob
74% matchVery Positive94% of 50 reviews2021
Dev: Pug Fugly GamesPub: Thalamus Digital
Windows
Aliens have invaded Earth! Towns, cities, deserts, they're everywhere! Take on the role of Earth's last super soldier and confront the alien menace in this intense twin stick shooter!
Why similar: Shooter 39%, Aliens 23.1%, Action 22.6%, Sci-fi 15.3%
- #41 Defend Earth: Xenos Survivors
73% matchVery Positive80% of 56 reviews2023
Dev: ReijaPub: indie.io
Windows
You are Earth's last line of defense in a relentless alien invasion. Experience intense top-down roguelite action across diverse landscapes, fighting invaders with a versatile arsenal. Outsmart, outgun, and survive your foes. Every run increases the challenge - so adapt, evolve, dominate!
Why similar: Aliens 41.6%, Sci-fi 40.1%, Action 18.2%
- #42 Tom Clancy’s Rainbow Six® Extraction
70% matchMixed66% of 3,089 reviews2023
Dev: Ubisoft MontrealPub: Ubisoft
Windows
Median: 2.8 hrsMean: 10.9 hrs≥1hr: 72%
Tom Clancy's Rainbow Six® Extraction is a tactical, co-op, PvE first-person shooter where you and your squad face an evolving alien threat. Teamwork, tactics, and flawless execution are key to your survival.
Why similar: Shooter 44.4%, Sci-fi 21.3%, Action 18.4%, Aliens 16%
- #43 Infested Planet
71% matchVery Positive94% of 3,014 reviews2014
Dev: Rocket Bear Games
Windows
Median: 3.1 hrsMean: 5.9 hrs≥1hr: 88%
Command a team of 5 elite soldiers against an alien horde of 100,000. Surrounded on all sides, you must outmaneuver and outsmart the enemy.
Why similar: Strategy 51.5%, Sci-fi 19.6%, Aliens 15.6%, Action 13.3%
- #44 Earth's Shadow
70% matchVery Positive91% of 94 reviews2023
Dev: WRF Studios
Windows
Earth's Shadow is a third person action Sci-Fi dungeon crawler set in the year 3081 on planet Sumbra; a remote alien planet where legends of valuable relics surround this black world, calling to the greedy and brave explorers seeking a bright future... but end up uncovering an even darker past.
Why similar: Shooter 36.4%, Aliens 25.8%, Action 15.9%, Third Person 13.2%, Sci-fi 8.7%
- #45 Earthfall
71% matchMixed65% of 2,293 reviews2018
Dev: Holospark
Windows
Median: 3.2 hrsMean: 6.8 hrs≥1hr: 87%
NOW AVAILABLE! When the Earth falls to an extra-terrestrial invasion, humanity becomes an endangered species. Earthfall is a four-player cooperative shooter that challenges players to survive hordes of ruthless alien drones and their inscrutable masters.
Why similar: Shooter 32.8%, Aliens 32.2%, Action 19.8%, Sci-fi 15.2%
- #46 E.T. Armies
73% matchMixed50% of 329 reviews2016
Dev: Raspina StudioPub: Merge Publishing
Windows
Median: 4.3 hrsMean: 4.9 hrs≥1hr: 93%
E.T. Armies is an action-packed, fast-paced, science-fiction first person shooter. The game takes place in a future where Earth has been reduced to ashes; It is now home to a new nation that hungers only for war. Prepare yourself to rise and defend against the invasion of the Forsaken.
Why similar: Sci-fi 55.4%, Action 44.6%
- #47 Terra Invicta
65% matchVery Positive81% of 9,023 reviews2026
Dev: Pavonis InteractivePub: Hooded Horse
Windows
Median: 9.5 hrsMean: 51.4 hrs≥1hr: 80%
An alien invasion has fractured humanity into seven ideological factions each with a unique vision for the future. Lead your chosen faction to take control of Earth’s nations, expand across the Solar System, and battle enemy fleets in tactical combat.
Why similar: Strategy 100%
- #48 Incoming + Incoming Forces
72% matchMixed56% of 353 reviews2014
Dev: Rage SoftwarePub: Funbox Media Ltd
Windows
Median: 3.5 hrsMean: 4.1 hrs≥1hr: 95%
Prepare for one of the most action packed-shooters in PC gaming history! Every level is full of enemies and targets for you to destroy! You will become a soldier of the alien species and protect your home world from the forces of the Human armada.
Why similar: Shooter 38.1%, Sci-fi 33.1%, Action 28.8%
- #49 Mass Effect™ 3 N7 Digital Deluxe Edition (2012)
69% matchMostly Positive76% of 2,720 reviews2020
Dev: BioWarePub: Electronic Arts
Windows
Median: 12.7 hrsMean: 42.1 hrs≥1hr: 72%
Earth is burning. The Reapers have taken over and other civilizations are falling like dominoes. Lead the final fight to save humanity and take back Earth from these terrifying machines, Commander Shepard.
Why similar: Third-Person Shooter 37.1%, Sci-fi 18.7%, Shooter 16.7%, Strategy 12.6%, Action 7.8%
- #50 EARTH DEFENSE FORCE: WORLD BROTHERS 2
67% matchVery Positive89% of 197 reviews2024
Dev: YUKE'SPub: D3PUBLISHER
Windows
The Earth is in pieces...again! We've gotta do more to save the planet!
Why similar: Third-Person Shooter 44.2%, Shooter 23.2%, Action 13%, Sci-fi 10.2%, Aliens 9.3%
- #51 X-17
71% matchMixed50% of 129 reviews2021
Dev: Panzer GamingPub: Volens Nolens Games
Windows
Median: 3.1 hrsMean: 3.2 hrs≥1hr: 78%
FPS/3rd Person Genre Shooter. Fight your way through an Alien Invasion not only on earth but on other planets.
Why similar: Sci-fi 41%, Shooter 33.2%, Action 25.8%
- #52 X-Morph: Defense
68% matchVery Positive92% of 4,073 reviews2017
Dev: EXOR Studios
Windows
Median: 3.0 hrsMean: 5.5 hrs≥1hr: 85%
Unique fusion of a top-down shooter and tower defense strategy. You are the invader! Use destructive weapons or lead your enemies into a maze of towers. Strategize in the build mode by carefully selecting various types of alien towers or throw yourself right into the heat of the battle.
Why similar: Strategy 27.4%, Shooter 22.2%, Aliens 21.2%, Sci-fi 19.3%, Action 9.8%
- #53 Anomaly: Warzone Earth
69% matchVery Positive87% of 4,668 reviews2011
Dev: 11 bit studios
Windows · Mac · Linux
Median: 2.4 hrsMean: 11.0 hrs≥1hr: 88%
Lead an armored squad through the perils of this reversed tower defense action-strategy game!
Why similar: Strategy 59.3%, Sci-fi 20.4%, Action 11.7%, Aliens 8.6%
- #54 UFO - Unfortunately Fortunate Organisms
69% matchVery Positive86% of 63 reviews2017
Dev: Rebourne StudiosPub: Back To Basics Gaming
Windows · Mac · Linux
Median: 3.2 hrsMean: 3.2 hrs≥1hr: 69%
U.F.O is an alien resource management action game where you beam up humans using your spaceship and churn them into resources to upgrade your spaceship. In 30 days, the evil galactic warlord will complete his master weapon. Can you defeat him in time or will he bring extinction to your race?
Why similar: Action 62.3%, Aliens 37.7%
- #55 EXOME
67% matchVery Positive80% of 316 reviews2022
Dev: RudeFrog Studios
Windows
EXOME is a co-op sci-fi survival shooter that blends wave-based survival with open-world exploration. Battle hordes of aliens, upgrade your arsenal, and uncover the hidden truths of the deep forest. Will you face it alone or bring your friends along?
Why similar: Third-Person Shooter 41.2%, Shooter 19.5%, Sci-fi 13.4%, Aliens 11.3%, Third Person 8.6%
- #56 Beat the Humans
65% matchVery Positive80% of 61 reviews2025
Dev: Dochungryest
Windows
Beat the Humans is the turn-based tactical strategy game. Here you lead an army of aliens against invaders from the human race. Collect your squad, protect planets, strengthen your army with equipment and look for allies if you want to survive and win.
Why similar: Strategy 78%, Action 22%
- #57 A.I. Invasion
70% matchMostly Negative35% of 66 reviews2015
Dev: GameArt Studio GmbH
Windows
Median: 4.1 hrsMean: 7.1 hrs≥1hr: 97%
A.I. Invasion is an action-loaded top-down-shooter in a futuristic setting. The superior machines subjugated the universe. In a wide range of missions you take the role of a soldier and equip and command a team of special units to reclaim the planet system.
Why similar: Strategy 44.5%, Shooter 28.3%, Action 27.2%
- #58 SENTRY
64% matchVery Positive83% of 853 reviews2024
Dev: Fireblade Software
Windows
Median: 2.7 hrsMean: 5.2 hrs≥1hr: 70%
SENTRY is an action-defense first person shooter where you defend your spaceship against invading aliens. Plot an escape route through hostile space and battle the enemy across your vessel with the support of traps, turrets and environmental destruction.
Why similar: Strategy 29%, Sci-fi 24.3%, Aliens 19.1%, Shooter 18.2%, Action 9.4%
- #59 Operation: New Earth
68% matchMixed61% of 819 reviews2016
Dev: Hunted Cow Games
Windows · Mac
Median: 2.4 hrsMean: 36.1 hrs≥1hr: 63%
Operation: New Earth is an intense sci-fi multiplayer strategy game in which you must command an advanced military facility to defend Earth from a hostile alien invasion. Create an alliance, gather resources, and unlock advanced technology to level up your stronghold!
Why similar: Strategy 61.8%, Sci-fi 21.5%, Aliens 16.7%
- #60 Alien Insanity
68% matchVery Positive86% of 50 reviews2017
Dev: Paul BirdPub: Marjupi Games
Windows
Aliens have invaded Earth and these thing are weird. Mechanical steam-powered shells... bipedal robots... flying eyeballs drones... Can this all be real? The aim of each level is simple: Kill all the aliens - then find the exit. 24 mind-bending levels! Create and share mods with the inbuilt level editor.
Why similar: Strategy 69.6%, Action 30.4%