- #1 SENTRY
97% 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: Tower Defense 26.5%, Aliens 12.3%, Survival 11.5%, FPS 10.4%, Strategy 10.2%
Why You'll Like It: A modern sci-fi FPS that emphasizes dynamic base defense and strategic trap placement against alien hordes.
- #2 Sanctum 2
96% matchVery Positive90% of 14,356 reviews2013
Dev: Coffee Stain StudiosPub: Coffee Stain Publishing
Windows · Mac · Linux
Median: 2.8 hrsMean: 6.7 hrs≥1hr: 85%
Sanctum 2 is the sequel to the world’s first Tower Defense/FPS hybrid game. Pick from four unique character classes and embark on a mission to protect the oxygen-producing Cores from hordes of deadly aliens who are threatened by their existence.
Why similar: Tower Defense 37.1%, Co-op 18%, FPS 10.6%, Strategy 7.5%, Multiplayer 6.1%
Why You'll Like It: This is the definitive FPS-tower defense hybrid that perfectly mirrors the core gameplay loop of defending a base with both traps and personal weaponry.
- #3 Fortified
96% 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 56.4%, Tower Defense 15.4%, Co-op 10%, Aliens 5.2%, Strategy 4.5%
Why You'll Like It: A retro-inspired sci-fi shooter that requires players to build defensive structures while fighting off waves of enemies.
- #4 Natural Selection 2
95% matchVery Positive85% of 13,305 reviews2012
Dev: Unknown Worlds Entertainment
Windows
Median: 2.9 hrsMean: 24.2 hrs≥1hr: 85%
A fast paced multiplayer shooter that pits aliens against humans in a strategic and action-packed struggle for survival!
Why similar: Multiplayer 18.3%, Aliens 13.4%, FPS 13%, Strategy 12.7%, RTS 10.7%
Why You'll Like It: Features asymmetric combat where players must balance FPS action with strategic base management against alien forces.
- #5 Orcs Must Die! 2
94% matchVery Positive92% of 19,505 reviews2012
Dev: Robot Entertainment
Windows
Median: 5.5 hrsMean: 11.9 hrs≥1hr: 91%
You’ve tossed, burned and sliced them by the thousands – now orcs must die more than ever before! Grab a friend and slay orcs in untold numbers in this sequel to the 2011 AIAS Strategy Game of the Year from Robot Entertainment.
Why similar: Tower Defense 45.4%, Co-op 24.9%, Strategy 9.7%, Multiplayer 8.2%, Action 6.1%
Why You'll Like It: While fantasy-themed, it is the gold standard for action-tower defense games where you must actively participate in the combat to survive.
- #6 X-Morph: Defense
94% 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: Tower Defense 34.7%, Co-op 17.3%, Aliens 15.7%, Strategy 11%, Sci-fi 7.5%
Why You'll Like It: A unique blend of top-down shooter and tower defense that forces you to strategically manipulate the battlefield while fighting.
- #7 Starship Troopers: Extermination
92% matchMostly Positive80% of 32,811 reviews2024
Dev: Offworld
Windows
Median: 4.9 hrsMean: 17.7 hrs≥1hr: 86%
Starship Troopers: Extermination is a 16-player co-op FPS that puts you on the far-off frontlines of an all-out battle against the Bugs! Squad up, grab your rifle, and do your part as an elite Deep Space Vanguard Trooper to take back planets from the Arachnid threat!
Why similar: Co-op 18.8%, Aliens 17.2%, Multiplayer 12.7%, FPS 9.9%, Sci-fi 8.5%
Why You'll Like It: An intense co-op horde shooter that captures the feeling of defending against overwhelming alien threats in a sci-fi setting.
- #8 Dungeon Defenders
93% matchVery Positive93% of 18,745 reviews2011
Dev: Chromatic Games
Windows
Median: 9.2 hrsMean: 42.0 hrs≥1hr: 89%
Create a hero from one of four classes to save Etheria in this 4-player coop Tower Defense Action-RPG. Includes Steam exclusive Portal gun & TF2 familiars!
Why similar: Tower Defense 43%, Multiplayer 26.4%, Survival 14.9%, Strategy 12%, Building 3.7%
Why You'll Like It: A classic co-op experience that balances character-based action with deep tower defense strategy.
- #9 The Riftbreaker
91% matchVery Positive90% of 23,181 reviews2021
Dev: EXOR Studios
Windows
Median: 8.0 hrsMean: 22.6 hrs≥1hr: 88%
The Riftbreaker is a solo or Co-op base-building, survival game with Action-RPG elements for up to 4 players. Hack & slash countless hordes of enemies. Build up your base, craft powerful weapons and research new inventions to survive.
Why similar: Tower Defense 33.7%, Multiplayer 22%, Survival 16.4%, RTS 14%, Strategy 10.2%
Why You'll Like It: This title masterfully combines base building, survival, and action-heavy defense against massive alien swarms.
- #10 Artificial Extinction
91% matchMostly Positive76% of 262 reviews2020
Dev: 100Hr Games Inc
Windows
You have 9 days to find a safe place on the planet. Your ship is low on fuel and you have to land. Setup sentry guns around you to defend yourself while you collect more fuel for the ship. AI controlled Drones and Tanks attack you trying to find weaknesses in your defenses.
Why similar: Tower Defense 37.7%, Strategy 16.4%, Survival 9.8%, Action 9.5%, FPS 8.5%
Why You'll Like It: An FPS tower defense game that tasks you with surviving against waves of robotic threats using both guns and turrets.
- #11 Stellarcraft
88% matchVery Positive91% of 99 reviews2026
Dev: DreamStudios
Windows
Stellarcraft is a sci-fi tower defense adventure: explore alien planets, gather resources, build defenses, and fend off waves of enemies, solo or in 4-player co-op. 🚀
Why similar: Co-op 25.4%, Multiplayer 15.7%, Survival 13.6%, Strategy 13.5%, RTS 12%
Why You'll Like It: An indie tower defense title that focuses on sci-fi survival and base protection.
- #12 Eden Rising
89% matchMixed64% of 1,447 reviews2019
Dev: The Wall Productions Inc.
Windows
Median: 54 minMean: 16.2 hrs≥1hr: 47%
Brace yourself for a brand new action-packed Open World. Explore a huge world to gather materials for gear and defenses. Use everything at your disposal to defend your bases and defeat hordes of hostile monsters. Play solo or up to 8-player online!
Why similar: Tower Defense 27.7%, Co-op 21%, Multiplayer 15.9%, Survival 10.2%, Strategy 9.5%
Why You'll Like It: An open-world survival game that integrates significant tower defense mechanics into its exploration and combat.
- #13 Deep Rock Galactic
87% matchOverwhelmingly Positive97% of 372,881 reviews2020
Dev: Ghost Ship GamesPub: Coffee Stain Publishing
Windows
Median: 14.2 hrsMean: 75.7 hrs≥1hr: 94%
Deep Rock Galactic is a 1-4 player co-op FPS featuring dwarven space miners, procedurally-generated destructible environments, and endless hordes of alien monsters. Explore cave systems, mine for minerals, and work together to survive!
Why similar: Co-op 33.5%, FPS 13%, Survival 10.3%, Space 9.4%, Shooter 9%
Why You'll Like It: Focuses on co-op survival and defense against alien hordes in procedurally generated sci-fi environments.
- #14 Earthfall
89% 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: Co-op 23.6%, Aliens 16.8%, FPS 12.1%, Violent 10.1%, Multiplayer 8.7%
Why You'll Like It: A co-op shooter focused on defending specific points against waves of alien enemies.
- #15 7 Days to Die
84% matchVery Positive87% of 396,805 reviews2024
Dev: The Fun PimpsPub: The Fun Pimps Entertainment LLC
Windows · Mac · Linux
Median: 16.8 hrsMean: 107.4 hrs≥1hr: 91%
7 Days to Die is an open-world game that is a unique combination of first-person shooter, survival horror, tower defense, and role-playing games. Play the definitive zombie survival sandbox RPG that came first. Navezgane awaits!
Why similar: Tower Defense 25.5%, Survival 25%, Multiplayer 19.4%, FPS 10.9%, Strategy 10%
Why You'll Like It: A survival game that places a massive emphasis on building fortified bases to survive periodic, intense horde attacks.
- #16 Infested Planet
86% 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: Tower Defense 34.4%, Strategy 20.7%, RTS 16.1%, Aliens 11.5%, Sci-fi 7.6%
Why You'll Like It: A strategy-focused tower defense game where you must clear alien infestations through tactical movement and base building.
- #17 Outerstellar
85% matchMostly Positive73% of 168 reviews2023
Dev: Strange Horizons Ltd
Windows
Stranded on a hostile and deadly planet, you must gather resources, build shelter, and fight to survive each night. But the secrets of this world await in a gripping sci-fi survival PvP game.
Why similar: Multiplayer 22.3%, Survival 20%, Space 12.6%, FPS 12.2%, Sci-fi 11.6%
Why You'll Like It: A multiplayer survival shooter that emphasizes sci-fi exploration and defensive combat.
- #18 Killing Floor 2
83% matchVery Positive88% of 128,238 reviews2016
Dev: Tripwire Interactive
Windows
Median: 9.9 hrsMean: 86.0 hrs≥1hr: 92%
In KILLING FLOOR 2, players descend into continental Europe after it has been overrun by horrific, murderous clones called Zeds that were created by rogue elements of the Horzine Corporation. 6-player Co-Op & 12-player VS Zed-slaughtering mayhem.
Why similar: Co-op 24.8%, Multiplayer 17.4%, Survival 15.4%, FPS 12.8%, Shooter 9.8%
Why You'll Like It: A fast-paced co-op shooter that emphasizes wave-based survival and defensive positioning.
- #19 Orcs Must Die! 3
82% matchVery Positive86% of 14,664 reviews2021
Dev: Robot Entertainment
Windows
Median: 6.5 hrsMean: 14.6 hrs≥1hr: 89%
Slice, burn, toss, zap, grind and gib massive hordes of repugnant orcs in this long-awaited successor to the award-winning Orcs Must Die! series.
Why similar: Tower Defense 43.7%, Co-op 29.9%, Strategy 11.3%, Multiplayer 10.7%, Action 4.4%
Why You'll Like It: The latest entry in the series that refines the action-tower defense formula with larger-scale battles.
- #20 Containment Corps
84% matchMixed63% of 52 reviews2017
Dev: Nimbus Interactive
Windows
The laser bow wielding security force has been called in. Fulfill your obligation to the Containment Corporation, keep the energy bases operational. Containment Corps mixes first person action with co-operative strategy and tower defense elements.
Why similar: Tower Defense 24.1%, Multiplayer 19.5%, Action 19.2%, Co-op 15.7%, FPS 14.5%
Why You'll Like It: An action-oriented FPS that incorporates tower defense elements into its mission-based gameplay.
- #21 Stellar Initiative
81% matchMostly Positive77% of 390 reviews2024
Dev: Five Head Games
Windows
Median: 1.7 hrsMean: 6.6 hrs≥1hr: 66%
Stellar Initiative is a roguelike tower defense game where you land on the planet and use your orbit ship to deliver buildings and support you with fire. Complete missions, install new upgrades, discover powerful artifacts, and find the best strategy!
Why similar: Tower Defense 44.6%, Aliens 17.7%, Strategy 15.8%, Sci-fi 12.9%, Space 7.5%
Why You'll Like It: A roguelike tower defense game with a sci-fi setting that emphasizes difficult, strategic encounters.
- #22 Alien Swarm: Reactive Drop
79% 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: Co-op 33.3%, Aliens 30.3%, Sci-fi 13.4%, Shooter 12.4%, First-Person 10.6%
Why You'll Like It: A tactical top-down co-op shooter that requires team coordination to defend against alien infestations.
- #23 Planetaries
80% matchMixed59% of 222 reviews2024
Dev: EY-Studio
Windows
Experience a vast Sci-fi open-world survival TD game set on a distant planet deep in the universe. Craft, build, mine, trade, explore, and survive in this alien world. Collect Data and defend against waves of enemies seeking to banish you. Enjoy the adventure in Singleplayer or Multiplayer.
Why similar: Tower Defense 26.9%, Co-op 22.4%, Multiplayer 17.1%, Survival 16%, Sci-fi 9%
Why You'll Like It: A co-op survival game that features base building and exploration on alien planets.
- #24 Alien Marauder
81% matchMixed63% of 341 reviews2021
Dev: Vexan Studio
Windows
“Alien Marauder” is a real-time strategy game with survival and confrontation theme. In this game, you will be the leader to a treacherous alien planet, build and defend base to survive against the vexan waves. Make the right decision!
Why similar: Tower Defense 25.4%, RTS 16.5%, Aliens 16.3%, Survival 15.5%, Strategy 12.1%
Why You'll Like It: An RTS-survival hybrid that emphasizes base defense against massive waves of alien enemies.
- #25 Fragmented
82% matchMixed43% of 1,964 reviews2017
Dev: Above and Beyond Technologies
Windows
Median: 42 minMean: 3.9 hrs≥1hr: 41%
Stranded in a hostile alien world, you must fight to survive. Hunt, harvest, craft, advance skills, and build using local resources along with technology from your voyage.
Why similar: Survival 28.1%, Multiplayer 22.3%, Co-op 13.6%, Sci-fi 6.9%, Shooter 6.4%
Why You'll Like It: An open-world survival game with multiplayer elements that focuses on base building and defense.
- #26 Serious Sam 4
78% 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: Co-op 26.4%, Violent 17%, FPS 16.4%, Multiplayer 16%, Shooter 9.5%
Why You'll Like It: An action-packed horde shooter that captures the sheer scale of fighting massive alien swarms.
- #27 Gore Storm
78% matchVery Positive94% of 70 reviews2023
Dev: Gundorado
Windows
Battle massive hordes of alien monsters to secure humanity's presence on planet Gore. Upgrade your base, hire troops, and install turrets to fight back the ever growing waves of aliens.
Why similar: Tower Defense 36.8%, Survival 17.1%, Aliens 15.5%, Shooter 12.2%, Action 9.8%
Why You'll Like It: An action-heavy shooter with roguelite elements that focuses on surviving against waves of enemies.
- #28 Forbidden Ingress
79% matchMostly Positive72% of 249 reviews2020
Dev: Strange_Indie_Team
Windows
Our world is in danger! Grab your gun and stop these uninvited guests!
Why similar: Co-op 22.2%, Tower Defense 18.2%, Multiplayer 12.9%, FPS 11.2%, Action 9.9%
Why You'll Like It: An action-adventure title with FPS elements that focuses on surviving in hostile environments.
- #29 Astro Looter: Survivor
77% matchMostly Positive71% of 423 reviews2024
Dev: Soda Game Studio
Windows · Mac
Explore alien planets to mine resources, kill alien insects, build defense turrets, and survive waves of insect attacks across the galactic frontier. Astro Looter combines elements of survival, roguelike, and tower defense in a top-down shooter.
Why similar: Tower Defense 36.8%, Survival 18.7%, FPS 14.4%, Shooter 11.6%, Realistic 10.8%
- #30 2112TD: Tower Defense Survival
77% matchVery Positive88% of 428 reviews2023
Dev: Refinery Games
Windows
Get ready for the ULTIMATE tower defense onslaught. Build, deploy, research and upgrade your defenses in this epic, old school RTS inspired sci-fi adventure.
Why similar: Tower Defense 31.5%, Aliens 17.1%, Survival 14.3%, Strategy 12%, Sci-fi 10.3%
- #31 Stellarcraft The Prologue
76% matchVery Positive91% of 76 reviews2024
Dev: DreamStudios
Windows
Stellarcraft is a thrilling sci-fi tower defense game where you explore planets, gather resources, and fend off enemy threats—solo or in 4-player co-op. Play the free demo now! 🚀
Why similar: Tower Defense 38.9%, Survival 19%, Strategy 13.6%, Sci-fi 12.6%, First-Person 7.7%
- #32 StarRupture
74% matchVery Positive81% of 10,861 reviews2026
Dev: Creepy Jar
Windows
Median: 6.6 hrsMean: 18.9 hrs≥1hr: 88%
StarRupture is a first-person open world base-building game with advanced combat and tons of exploration. Play alone or in a group on this sublime and ever-changing planet, extract and manage resources, create your complex industrial system and fight off hordes of alien monsters.
Why similar: Co-op 30.8%, Multiplayer 20%, Survival 19.7%, Sci-fi 12%, Shooter 11%
- #33 Desperate Place
76% matchMostly Positive73% of 292 reviews2025
Dev: BruceGalaxy
Windows
Desperate Place is a strategic tower defense game where you play as a crew member who wakes up early on a damaged colonization starship. Stranded on an unknown planet, you must gather resources, repair the ship, and defend against alien monsters to survive and escape.
Why similar: Tower Defense 33.1%, Survival 14.8%, Strategy 13.2%, Space 11.8%, Sci-fi 10.6%
- #34 Towerful Defense: Prologue
75% matchVery Positive88% of 75 reviews2024
Dev: Mini Fun Games
Windows · Mac · Linux
A tower defense action roguelike where you control a single tower to fight against hordes of aliens coming from all directions. Pick your tower, equip up to 4 skills, and choose from a variety of traits and items to craft powerful builds that lead you to victory.
Why similar: Tower Defense 34.7%, Aliens 17.4%, RTS 14.5%, Strategy 13.7%, Survival 12.8%
- #35 Defend Earth: Xenos Survivors
74% 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 36.8%, Survival 28.1%, Sci-fi 18.7%, Action 11.9%, Indie 4.4%
- #36 LIFE EFFECT Survival
71% matchVery Positive89% of 243 reviews2026
Dev: LIFE EFFECTPub: EFFECT STUDIO
Windows
Survive in a harsh and dangerous world after an alien invasion. Gather resources, craft equipment, fight mutants and massive monsters, use weapons, vehicles and robots, explore territories, defend strongholds and fight for survival.
Why similar: Aliens 29.9%, Survival 19.9%, FPS 16.4%, Shooter 12.6%, Realistic 12%
- #37 Star Survivor
73% matchMixed69% of 555 reviews2024
Dev: SpaceOwl Games
Windows
Median: 3.1 hrsMean: 6.2 hrs≥1hr: 76%
Star Survivor is a space-themed survival game that blends intense deckbuilding strategy. Pilot humanity's last spaceship through the vast galaxy, Unlock powerful weapon combos, collect card modules, and craft unique builds. As the enemy swarms grow denser, will you be the last one standing?
Why similar: Survival 47.4%, Space 35.2%, Action 17.4%
- #38 Survivor
75% matchMixed55% of 223 reviews2021
Dev: kolacape
Windows
Get ready for an intense survival battle against an ever-growing horde of zombies. Play solo or co-op with friends, test your shooting skills and luck in this relentless combat and see how long you can stay alive.
Why similar: Co-op 24%, Multiplayer 16.2%, Survival 14.4%, FPS 12.4%, Shooter 10.2%
- #39 Alien Robot Monsters
73% matchVery Positive85% of 124 reviews2015
Dev: Kraftix Games
Windows · Mac · Linux
Median: 7.0 hrsMean: 11.9 hrs≥1hr: 95%
Epic sci-fi tower defense action with 16-bit era look and feel, pitching your colonists against an almost endless horde of hostile alien robots who strongly oppose your attempts of colonizing their planet! Deluxe version includes the soundtrack!
Why similar: Tower Defense 45.9%, Strategy 30.9%, Action 16.8%, Indie 6.3%
- #40 Craterbound
73% matchMixed54% of 99 reviews2022
Dev: Daniel Marquez
Windows
Crash-land onto a unique and hostile alien world and begin your fight to survive. Face its inhabitants, upgrade your technology, create outposts & bases, and find a way to repair your ship. Explore the beautifully strange terrain, all while blasting and crafting your way off of the planet.
Why similar: Survival 25.3%, Aliens 19.5%, Space 19%, Sci-fi 14.1%, First-Person 10.6%
- #41 Shatterline
67% matchMostly Positive73% of 29,161 reviews2025
Dev: Frag Lab LLC
Windows
Median: 1.9 hrsMean: 15.6 hrs≥1hr: 65%
Get ready for the apocalypse! Shatterline is a high-octane single-player FPS adventure where Earth’s survival hangs in the balance. Pick a unique operator and combat the alien plague!
Why similar: FPS 15.8%, Co-op 14.5%, Multiplayer 14.1%, Sci-fi 13.1%, Shooter 12.6%
- #42 Murnatan
72% matchMixed64% of 118 reviews2018
Dev: AAAGAMES
Windows · Linux
Humans VS Aliens FPS shooter combined with RTS.
Why similar: Action 46.5%, FPS 36.4%, Indie 17.1%
- #43 Defense: Abominations
72% matchMostly Positive74% of 54 reviews2018
Dev: Ominous Entertainment
Windows · Mac · Linux
Defense: Abominations is a first person tower defense game where you try to survive the abominations stored in the laboratory, as long as you can.
Why similar: Violent 27.2%, Tower Defense 19.3%, Strategy 16.4%, Survival 11%, Action 9.5%
- #44 Defender Bros
69% matchVery Positive88% of 104 reviews2024
Dev: Lucky DartPub: The Bueno Interactive
Windows
Prepare your defenses during the day and survive until dawn. Defender Bros is a Top-Down Tower Defense Roguelike where you play as a Soldier defending your Base. Pick between multiple abilities as you level up to increase you power, then after each run buy perks and get stronger
Why similar: Tower Defense 39.2%, Aliens 22.1%, Multiplayer 17.7%, Strategy 15.8%, Action 3.3%
- #45 Silica
68% matchMostly Positive76% of 4,752 reviews2023
Dev: Martin 'Dram' MelichárekPub: Bohemia Interactive
Windows
Median: 2.9 hrsMean: 7.9 hrs≥1hr: 75%
Silica blends FPS and RTS in epic, photorealistic battles. Choose to fight on the ground or command from above as humans or aliens. Dive into thrilling multiplayer combat or master strategic command. Are you ready to survive and conquer?
Why similar: Aliens 15.8%, Multiplayer 13.9%, RTS 13.6%, Co-op 11.3%, FPS 10.3%
- #46 Galactic Force
71% matchMostly Positive72% of 89 reviews2018
Dev: FreezeNova
Windows
Galactic Force is a sci-fi FPS loaded with frantic action and lots of firepower.
Why similar: Co-op 16.7%, Action 13.6%, Aliens 12.3%, Multiplayer 11.3%, FPS 10.8%
- #47 Block Fortress 2
67% matchVery Positive82% of 260 reviews2025
Dev: Foursaken Media
Windows · Mac
Choose a planet, build your fortress, and prepare for war. Arm yourself with powerful weapons, deploy troops, and defend your stronghold against relentless attacks. In this action-packed block-builder, survival is earned, and only the strongest will remain.
Why similar: Tower Defense 40.8%, FPS 18.9%, Action 12.1%, Shooter 11.5%, First-Person 7.1%
- #48 Last Resort
71% matchMixed57% of 143 reviews2021
Dev: Team SoupvisionPub: Breda University of Applied Sciences
Windows
Last Resort is a small co-op shooter in which you and up to 3 others defend humanity's first hotel on Mars against hostile aliens. Defend & power up generators, upgrade your weapons and gun down hordes of aliens to save the hotel!
Why similar: Co-op 29.4%, FPS 15.5%, Violent 11.9%, Shooter 8.8%, Space 7.8%
- #49 Acid Planet
68% matchMostly Positive80% of 69 reviews2024
Dev: Adam Travers
Windows
Acid Planet is a caustic blend of horde-survival, tower-defense and strategy. Build, fight and evolve to survive against rampaging swarms of monsters and fearsome Kaiju.
Why similar: Tower Defense 44.8%, RTS 19.6%, Strategy 16.2%, Survival 15.1%, Building 4.3%
- #50 Let Them Come
69% matchVery Positive84% of 1,353 reviews2017
Dev: Tuatara GamesPub: Versus Evil
Windows · Mac
Median: 2.8 hrsMean: 3.7 hrs≥1hr: 83%
Let Them Come is a fast paced pixel art shoot ‘em up. Twitchy trigger fingers and focused battle tactics are the order of the day as wave after wave of alien-like creatures try to take you down.
Why similar: Tower Defense 28%, Aliens 17.6%, Violent 13.5%, Survival 10.4%, Shooter 7.7%
- #51 Project Asteroids
69% matchMixed56% of 128 reviews2024
Dev: Aleksandr Serdiuk
Windows
In the vastness of space, you are a lone robot desperately trying to survive. Build, explore, and fight for your life as you face deadly threats in the asteroid belt. This hardcore game shows no mercy—dangers lurk at every step, ready to destroy you at any moment.
Why similar: Multiplayer 24.7%, Survival 24.4%, FPS 16%, First-Person 8.7%, Action 7.9%
- #52 No Creeps Were Harmed TD
67% matchVery Positive89% of 482 reviews2024
Dev: MinMax Games Ltd.
Windows
Median: 2.8 hrsMean: 5.5 hrs≥1hr: 74%
Employ lethal turrets, traps, and gadgets to defend against an onslaught of evolving creeps! Step into a twisted, hyper 3D, mind bending realm. Upgrade and adapt your defenses. Become a master maze crafter. Collect bizarre artifacts. Rush creeps for lucrative rewards, and succumb to greed!
Why similar: Tower Defense 33.5%, Aliens 15.6%, Multiplayer 12%, Strategy 11.7%, Survival 10.9%
- #53 Unstoppable Gorg
70% matchMostly Positive79% of 306 reviews2012
Dev: Futuremark
Windows · Mac
Median: 36 minMean: 6.3 hrs≥1hr: 40%
Defend the solar system from fearsome aliens by sending satellites into orbit in revolutionary tower defense action!
Why similar: Tower Defense 58.8%, Strategy 14.6%, Aliens 8.9%, Sci-fi 6.7%, Action 5.1%
- #54 EXOME
68% 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: Aliens 26.1%, Co-op 23.1%, Shooter 17.6%, Sci-fi 16.3%, Action 10.4%
- #55 Operation: New Earth
70% 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 40.6%, Aliens 20.1%, Multiplayer 17.9%, Sci-fi 13.6%, Survival 7.8%
- #56 TDS - Tower Defense Strategy
65% matchVery Positive81% of 354 reviews2025
Dev: Blockage
Windows · Mac · Linux
TOWER ▪ DEFENSE ▪ STRATEGY. Control Vessels. Utilize their uniquely deep set of towers. Create an everchanging defense. Play with friends. Protect your Basin at all costs. An absolute Tower Defense, Real-Time Strategy Hybrid
Why similar: Tower Defense 31.2%, Co-op 24.1%, RTS 16%, Multiplayer 14.5%, Strategy 5.5%
- #57 Rogue Star Rescue
67% matchVery Positive90% of 136 reviews2021
Dev: Chute Apps
Windows · Mac · Linux
Bullet Hell Insanity + Tower Defense Strategy. Rogue Star Rescue is a quirky new type of rogue-like shooter. Blast your way through diverse planets while rescuing your teammates and gathering traps for your defense strategy. Play solo or online to stop the Rogue Star before it annihilates everything!
Why similar: Tower Defense 44.2%, Co-op 25.2%, Strategy 15.6%, Shooter 10%, Action 5%