- #1 Alien Hallway 2
97% matchMixed68% of 168 reviews2017
Dev: Sigma Team Inc.
Windows
Median: 2.7 hrsMean: 13.1 hrs≥1hr: 65%
We're happy to present a new game in the Alien Shooter universe! Get prepared to unique tactical gameplay, lots of monster types and 8 fighter types allowing you create your own style of completing missions and defeating bosses.
Why similar: Aliens 23.8%, Shooter 12.8%, Tactical 10.8%, Inventory Management 9.7%, Isometric 9.6%
Why You'll Like It: As the direct sequel, it refines the original's lane-based strategy and action-shooter mechanics with updated visuals and gameplay.
- #2 Alien Shooter TD
96% matchVery Positive85% of 908 reviews2017
Dev: Sigma Team Inc.
Windows
Median: 3.8 hrsMean: 7.3 hrs≥1hr: 95%
Innovative Tower Defense inspired by legendary Alien Shooter series! The game was created in keeping with the best traditions of Sigma`s games, no concessions of any kind - everything is just like in real life!
Why similar: Tower Defense 25.8%, Aliens 18.1%, Inventory Management 12.3%, Shooter 10.6%, Sci-fi 9.1%
Why You'll Like It: It shares the same gritty sci-fi aesthetic and intense combat focus as the original, translated into a dedicated tower defense format.
- #3 Infested Planet
96% 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 36.3%, Strategy 17.4%, Aliens 15.5%, Sci-fi 9.8%, Tactical 9%
Why You'll Like It: This game perfectly captures the feeling of fighting overwhelming alien swarms using tactical unit placement and strategic map control.
- #4 Anomaly: Warzone Earth
95% 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: Tower Defense 39.5%, Strategy 24.4%, Sci-fi 12.4%, Aliens 10.4%, Action 6.3%
Why You'll Like It: This title offers a unique 'reverse tower defense' experience where you manage a squad through lanes, mirroring the strategic movement of Alien Hallway.
- #5 Defense Grid: The Awakening
94% matchOverwhelmingly Positive96% of 5,303 reviews2008
Dev: Hidden Path Entertainment
Windows
Median: 4.6 hrsMean: 15.1 hrs≥1hr: 91%
Defense Grid: The Awakening is a unique spin on tower defense gameplay that will appeal to players of all skill levels. A horde of enemies is invading, and it's up to the player to stop them by strategically building fortification towers around their base.
Why similar: Tower Defense 65.2%, Strategy 10.9%, Sci-fi 9.9%, Aliens 9.7%, Indie 2.5%
Why You'll Like It: It is widely considered a gold standard for sci-fi tower defense, offering deep strategic planning and satisfying wave-based combat.
- #6 Harvest: Massive Encounter
94% matchMostly Positive79% of 159 reviews2009
Dev: Oxeye Game Studio
Windows · Mac · Linux
Median: 1.2 hrsMean: 3.9 hrs≥1hr: 54%
Harvest: Massive Encounter is an award-winning real-time strategy game with battles of epic proportions and a unique style of resource management and exploration. Build power plants, mineral harvesters and defense towers and make sure they have sufficient energy to fend off endless hordes of evil aliens.
Why similar: Tower Defense 59.3%, Strategy 21.6%, Sci-fi 10.1%, Indie 7.1%, Singleplayer 1.9%
Why You'll Like It: A classic sci-fi tower defense game that emphasizes resource gathering and base protection against relentless waves of enemies.
- #7 Iron Marines
93% matchMostly Positive78% of 1,831 reviews2019
Dev: Ironhide Game Studio
Windows · Mac · Linux
Median: 5.1 hrsMean: 11.4 hrs≥1hr: 87%
Real-time strategy battles in amazing sci-fi worlds! Command brave soldiers, mighty mechas and powerful aliens to face the greatest challenges in hostile alien worlds. The galaxy needs you!
Why similar: Aliens 32.7%, Sci-fi 19.5%, Space 17.7%, Strategy 15.6%, Action 7.1%
Why You'll Like It: This sci-fi RTS features hero units and lane-based skirmishes that feel like a more modern, polished evolution of the original's combat style.
- #8 2112TD: Tower Defense Survival
92% 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 25.2%, Aliens 17.5%, Tactical 12.3%, Space 11.6%, Isometric 10.1%
Why You'll Like It: This game offers a high-quality, sci-fi focused tower defense experience with a strong emphasis on tactical survival.
- #9 SENTRY
91% 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 27.6%, Aliens 16.4%, Space 11.7%, Inventory Management 10.9%, Sci-fi 10.5%
Why You'll Like It: A modern sci-fi tower defense game that integrates FPS mechanics, perfect for players who enjoy active combat alongside their strategy.
- #10 Kingdom Two Crowns
91% matchVery Positive90% of 37,612 reviews2018
Dev: Stumpy🐙SquidPub: Raw Fury
Windows · Mac · Linux
Median: 6.5 hrsMean: 18.6 hrs≥1hr: 92%
Gather coins, build defenses and reclaim your fallen Kingdom. Explore and uncover secrets, unlock new technologies and protect your crown versus waves of Greed monsters that come at night. Kingdom is a solo or co-op micro-strategy and tower defense game set in an atmospheric pixel world.
Why similar: Tower Defense 56.5%, Base Building 27.8%, Strategy 12.2%, Singleplayer 3.4%
Why You'll Like It: While the setting is different, the side-scrolling lane-based defense and resource management loop provides a very similar tactical satisfaction.
- #11 Unstoppable Gorg
90% 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 57.1%, Strategy 11.3%, Aliens 11.2%, Sci-fi 7.9%, Space 5.8%
Why You'll Like It: This sci-fi tower defense game features unique orbital mechanics that add a fresh layer of strategy to the standard wave-defense formula.
- #12 Let Them Come
89% 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 32%, Aliens 25.7%, Shooter 13.4%, Sci-fi 7.8%, Strategy 5.6%
Why You'll Like It: A pure action-focused wave survival game that captures the 'hold the line' intensity of the original.
- #13 McDROID
89% matchMostly Positive73% of 215 reviews2014
Dev: Elefantopia
Windows
Median: 3.3 hrsMean: 4.3 hrs≥1hr: 93%
Farm, Build, Defend, in the Galaxy's only Arcade-Tower-Defense.
Why similar: Tower Defense 31.9%, Base Building 22.2%, Aliens 16%, Shooter 10.3%, Strategy 8.7%
Why You'll Like It: This third-person action tower defense game features similar base-building and sci-fi combat elements in a fast-paced environment.
- #14 Protolife
88% matchVery Positive86% of 465 reviews2018
Dev: Volcanic Giraffe
Windows · Mac
Median: 3.2 hrsMean: 7.7 hrs≥1hr: 74%
Protolife is an unique tower-based strategy game which gives you a direct control over the builder robot in a struggle against the hungry proto-life organism.
Why similar: Tower Defense 33.2%, Base Building 22.4%, Aliens 18.2%, Sci-fi 11.6%, Strategy 9.8%
Why You'll Like It: A strategic base-building and tower defense game that requires careful planning to survive against aggressive, encroaching organisms.
- #15 Orcs Must Die! 2
86% 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 63.9%, Strategy 10.9%, Shooter 9.3%, Action 6.5%, RPG 5.1%
Why You'll Like It: It blends third-person action with tower defense, requiring the same active participation in combat that Alien Hallway demands.
- #16 Super Sanctum TD
86% matchVery Positive87% of 1,575 reviews2013
Dev: Coffee Stain StudiosPub: Coffee Stain Publishing
Windows · Mac
Median: 1.9 hrsMean: 33.2 hrs≥1hr: 75%
Super Sanctum TD is a retro-styled Tower Defense game that focuses on strategy, customization and replayability. Build advanced mazes and construct powerful towers to prevent alien hordes from reaching the Core!
Why similar: Tower Defense 39.3%, Aliens 20.8%, Isometric 12.9%, Sci-fi 9.1%, Strategy 8%
Why You'll Like It: An isometric tower defense game that emphasizes strategic placement and managing diverse enemy types.
- #17 Rush for Glory
87% matchMixed61% of 148 reviews2014
Dev: Parseh Game StudioPub: KATNAPPE SP. Z O. O.
Windows
Median: 24 minMean: 29.8 hrs≥1hr: 34%
Rush for Glory is featuring challenging and rewarding Tower Defense battles, in which players are defending their base against an alien invasion. By strategically building towers and upgrading them, the player can keep his base safely and further progress through the extensive singleplayer campaign.
Why similar: Tower Defense 67.7%, Strategy 22.8%, Action 9.4%
Why You'll Like It: A traditional tower defense game that provides a solid, sci-fi focused experience with multiple defensive options.
- #18 They Are Billions
84% matchVery Positive85% of 50,609 reviews2019
Dev: Numantian Games
Windows
Median: 14.1 hrsMean: 56.0 hrs≥1hr: 91%
They Are Billions is a Steampunk strategy game set on a post-apocalyptic planet. Build and defend colonies to survive against the billions of the infected that seek to annihilate the few remaining living humans. Can humanity survive after the zombie apocalypse?
Why similar: Base Building 43.9%, Tower Defense 32.5%, Strategy 13.7%, Tactical 5.9%, Isometric 2.2%
Why You'll Like It: The intense pressure of defending against massive, encroaching swarms provides a similar high-stakes survival experience.
- #19 Sanctum 2
84% 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 59.4%, Strategy 9.6%, Sci-fi 8.6%, Aliens 8.3%, Shooter 5.7%
Why You'll Like It: This FPS tower defense hybrid allows you to directly engage with the alien threats while managing your defensive structures.
- #20 Alien Robot Monsters
85% 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 50%, Strategy 26.8%, Action 14.1%, Indie 9.1%
Why You'll Like It: This title combines classic tower defense strategy with a sci-fi aesthetic and fast-paced action elements.
- #21 Dungeon of the ENDLESS™
82% matchVery Positive85% of 13,956 reviews2014
Dev: AMPLITUDE Studios
Windows · Mac
Median: 3.1 hrsMean: 10.6 hrs≥1hr: 73%
Dungeon of the ENDLESS™ is a Rogue-Like Dungeon-Defense game, in which the player and their team of heroes must protect the generator of their crashed ship while exploring an ever-expanding dungeon, all while facing waves of monsters and special events as they try to find their way out...
Why similar: Tower Defense 48.8%, Strategy 18%, Sci-fi 15.7%, RPG 11%, Indie 5.1%
Why You'll Like It: This game combines tower defense with roguelike exploration, focusing on defending a base against waves of alien threats.
- #22 Tower Dominion
79% matchVery Positive86% of 4,827 reviews2025
Dev: Parallel 45 Games
Windows
Median: 11.7 hrsMean: 21.5 hrs≥1hr: 90%
Build and design the terrain while defending your stronghold against alien invasion in this unique Roguelike tower defense. Choose from 30 heroes, survive enemy waves, and upgrade a variety of destructive towers to hold the line!
Why similar: Tower Defense 30.4%, Base Building 18.4%, Tactical 13.6%, Aliens 11.7%, Strategy 8.5%
Why You'll Like It: A modern take on tower defense that includes base-building and RTS elements for a more comprehensive strategic experience.
- #23 Anomaly Defenders
83% 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: Tower Defense 59.7%, Strategy 20.9%, Action 8.7%, Indie 5.4%, Sci-fi 5.3%
Why You'll Like It: As a traditional tower defense entry in the Anomaly series, it focuses on protecting your base from incoming waves of enemies.
- #24 Galaxy Defense War
80% matchVery Positive97% of 144 reviews2025
Dev: Zero Space
Windows
'Galaxy Defense War' is a roguelike tower defense game where you need to select suitable galactic principles from randomly dropped heroes and equipment to form a combat-ready team to resist alien invaders.
Why similar: Tower Defense 37.9%, Base Building 21.5%, Aliens 20.9%, Strategy 16.2%, Indie 1.9%
Why You'll Like It: A 2D lane-based tower defense game that incorporates base-building elements to help hold off alien invaders.
- #25 Towerful Defense: Prologue
81% 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 41.8%, Aliens 26.9%, Strategy 13.1%, RPG 9.2%, Action 6.5%
Why You'll Like It: This game mixes action-roguelike elements with tower defense, offering a fast-paced and replayable experience.
- #26 Rogue Invader
82% matchVery Positive92% of 64 reviews2021
Dev: Squishy Games
Windows · Mac
Median: 3.1 hrsMean: 4.9 hrs≥1hr: 91%
1-Bit Roguelite Action Shooter.
Why similar: Aliens 21.7%, Inventory Management 14.6%, Shooter 11.5%, Isometric 10.9%, Sci-fi 10.4%
Why You'll Like It: This sci-fi shooter features wave-based progression and a focus on singleplayer action against alien forces.
- #27 GemCraft - Frostborn Wrath
81% matchVery Positive89% of 2,818 reviews2020
Dev: Game in a Bottle
Windows
Median: 3.9 hrsMean: 38.1 hrs≥1hr: 90%
The epic tower defense dark fantasy journey continues! Create powerful gems with various abilities and take on the battle against an endlessly flowing army of monsters, and face the growing darkness as you fight your way back towards the Spiritforge.
Why similar: Tower Defense 50.3%, Tactical 22.8%, Strategy 14.7%, Action 7.3%, Indie 2.6%
Why You'll Like It: It offers deep, complex tower defense mechanics that reward strategic thinking and careful resource management.
- #28 No Creeps Were Harmed TD
79% 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 35.7%, Aliens 21.3%, Sci-fi 12.7%, Tactical 10.3%, Strategy 10%
Why You'll Like It: A modern 3D tower defense game that focuses on tactical placement and managing sci-fi defensive systems.
- #29 Dome Keeper
76% matchVery Positive92% of 19,233 reviews2022
Dev: BippinbitsPub: Raw Fury
Windows · Mac · Linux
Median: 4.1 hrsMean: 10.8 hrs≥1hr: 87%
Defend against waves of alien monsters in this unique roguelike action miner. Dig for resources, collect useful gadgets, and upgrade equipment to increase odds of survival – just hurry back before your dome is destroyed!
Why similar: Tower Defense 32.1%, Space 20.2%, Tactical 18.8%, Sci-fi 16.7%, Action 7.9%
- #30 Alien Shooter
77% matchOverwhelmingly Positive95% of 4,607 reviews2009
Dev: Sigma Team Inc.
Windows
Median: 3.1 hrsMean: 9.1 hrs≥1hr: 85%
The endless darkness and the somber, long passages of a military complex have become the abode of evil, thousands of blood-thirsty creatures fill its offices, storehouses and mysterious laboratories. About 1,000 monsters on each map, showing up to 100 monsters simultaneously on one playing screen.
Why similar: Aliens 31.6%, Shooter 18.5%, Isometric 14.5%, Sci-fi 12.2%, RPG 6.3%
- #31 XENOBREAKERS: Classic Tower Defense
75% matchVery Positive86% of 83 reviews2025
Dev: Couch Potato Studios
Windows
Defend Billy and his crew on their way to the extraction zone! You have been authorized to use the defense system. Protect them from giant bugs, malfunctioning droids and more...
Why similar: Aliens 22.2%, Strategy 19.1%, Sci-fi 18.4%, Tactical 18.2%, Tower Defense 6.7%
- #32 Stellar Survivor
77% matchMixed66% of 175 reviews2019
Dev: Sticks & Stones
Windows
Stranded on an alien planet, you must defend your Powercore! Use your weapons to fight hordes of alien enemies and strategically use traps in this new FPS tower-defense survival game!
Why similar: Tower Defense 28.7%, Aliens 21.2%, Strategy 12.4%, Space 10%, Shooter 9.4%
- #33 Defendoooooor!!
78% matchMixed46% of 68 reviews2017
Dev: White Dog GamesPub: SA Industry
Windows
Median: 54 minMean: 14.6 hrs≥1hr: 47%
In Defendoooooor!!!, it's your job to fight an alien invasion.
Why similar: Tower Defense 27.6%, Shooter 13.3%, Action 13%, Sci-fi 12.9%, Platformer 12.4%
Why You'll Like It: A simple, arcade-style wave defense game that focuses on quick reactions and holding your ground against incoming threats.
- #34 Alien Attack
76% matchMostly Positive77% of 241 reviews2016
Dev: Alien Jellyfish
Windows
Median: 3.8 hrsMean: 5.8 hrs≥1hr: 97%
You are a space trooper. Your crew finished the cleaning mission and left you alone by accident. Now you are surrounded by aliens. Persist them as long as you can.
Why similar: Action 62.2%, Indie 37.8%
- #35 Half Hour Hexagon
74% matchVery Positive84% of 112 reviews2023
Dev: Carson Kompon
Windows
Obliterate a never-ending horde of enemies while you attempt to reach the 30 minute mark. Race to earn XP and level up to gain new items and opportunities for each run to become stronger than the last.
Why similar: Shooter 47.6%, Arcade 29.1%, Action 19.8%, Singleplayer 3.5%
- #36 Stellar Initiative
73% 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 34%, Aliens 17.3%, Base Building 16.7%, Sci-fi 12%, Strategy 9.6%
- #37 Natural Selection 2
72% 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: Aliens 29.7%, Strategy 17.5%, Sci-fi 15.7%, Tactical 9.8%, Shooter 9.7%
- #38 Project Astra Dominium
72% matchVery Positive90% of 88 reviews2024
Dev: Snob Entertainment UG
Windows · Mac · Linux
Project Astra Dominium is a Tower Defense game with Basebuilding and Automation elements. Build up your base to become a supply hub for Earth's desperately needed materials, gather resources while defending against an unknown alien threat and improve your tower's and AI capabilities.
Why similar: Tower Defense 25.2%, Aliens 21.4%, Base Building 17.3%, Space 14.6%, Sci-fi 7.8%
- #39 NS2: Combat
75% matchMixed54% of 293 reviews2014
Dev: Faultline GamesPub: Unknown Worlds Entertainment
Windows
Median: 2.8 hrsMean: 10.9 hrs≥1hr: 81%
NS2: Combat is a powerful twitch-shooter where space marines battle aliens through a competitive mixture of MOBA & FPS playstyles. Are you ready?
Why similar: MOBA 45% ★, Shooter 13.8%, Action 10.9%, Aliens 10%, Sci-fi 8.4%
- #40 Towerful Defense: A Rogue TD
71% matchMostly Positive73% of 227 reviews2024
Dev: Mini Fun Games
Windows · Mac · Linux
Median: 2.1 hrsMean: 4.2 hrs≥1hr: 67%
A roguelike tower defense 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 unique effect items to craft powerful builds that lead you to victory.
Why similar: Tower Defense 63%, Strategy 17%, RPG 12.5%, Action 7.5%
- #41 Alien Shooter: Revisited
74% matchMixed64% of 849 reviews2009
Dev: Sigma Team Inc.
Windows
Median: 3.2 hrsMean: 7.9 hrs≥1hr: 87%
Crowds of blood-thirsty monsters, crawling from every corner of the secret research base. Gloomy basements and modern labs, darkness changing into blazing bulbs. The only usual thing is: you're in a bad place alone, and there's no one to help you!
Why similar: Shooter 23.5%, Aliens 22.7%, RPG 16.1%, Isometric 15.6%, Action 12.7%
- #42 X-Morph: Defense
71% 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 34.5%, Aliens 20%, Shooter 9.7%, Isometric 9.5%, Sci-fi 9.1%
- #43 Defense Task Force - Sci Fi Tower Defense
73% matchMixed66% of 53 reviews2018
Dev: ChillX Ltd
Windows
Defense Task Force Featuring Large Scale Procedurally Generated Tower Defense Battles with FPS Quality Visuals and Infinite Waves. 10 tower types, with different attacks , 3 levels plus boosts. 25 Enemy alien species: Regulars, Swarmers, Racers, Cloakers, Healers, Boss Units and Spawners.
Why similar: Tower Defense 57.4%, Strategy 20.1%, Sci-fi 15.7%, Indie 6.8%
- #44 Radiant Defense
73% matchVery Positive83% of 146 reviews2014
Dev: Hexage
Windows
MILLIONS OF ALIENS WILL DIE!Radiant Defense is a tower defense game set in a vibrant universe invaded by countless alien hordes.Build your space fortress any way you wish, set up wide variety of weapons and traps and let the invasions begin!
Why similar: Tower Defense 38.8%, Space 20.4%, Strategy 12.9%, Aliens 12.8%, Sci-fi 6%
- #45 Gore Storm
70% 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 38.4%, Aliens 20.7%, Shooter 19.3%, Sci-fi 11%, Action 7.8%
- #46 Black blood
71% matchMixed67% of 57 reviews2020
Dev: Arcane Games
Windows
Black blood is a mix of hardcore Tower Defense strategy and top-down shooter. Act as a defender against alien invaders, attack and destroy all their insidious plans...
Why similar: Tower Defense 33.6%, Aliens 30.7%, Shooter 15.5%, Strategy 10.3%, Action 4.9%
- #47 Alien Marauder
70% 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 26.4%, Base Building 22.5%, Aliens 21.7%, Sci-fi 13.2%, Strategy 10.1%
- #48 Wall World
65% matchVery Positive91% of 11,769 reviews2023
Dev: Alawar
Windows
Median: 4.2 hrsMean: 9.7 hrs≥1hr: 85%
Explore the mysterious Wall World on your giant robospider: mine for valuable resources, upgrade your equipment to fight off hordes of monsters, and discover exotic biomes in-between attacks. Will you be able to survive and learn the secrets of the Wall World?
Why similar: Tower Defense 36.3%, Aliens 25.2%, Side Scroller 11.4%, Strategy 10.8%, Sci-fi 9.8%
- #49 Aliens: Dark Descent
65% 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: Tactical 22%, Aliens 21.9%, Strategy 14.4%, Sci-fi 12.4%, Space 10.8%
- #50 Ancient Planet Tower Defense
69% matchVery Positive82% of 1,186 reviews2015
Dev: Moonlight Mouse
Windows · Mac
Median: 3.3 hrsMean: 7.5 hrs≥1hr: 92%
Ancient Planet is classic tower defense game. The stronghold of an ancient civilization has been invaded by hordes of alien raiders. Use powerful technologies of the Ancient and repel the attack of the enemy's armies!
Why similar: Tower Defense 72.3%, Strategy 13.5%, Isometric 9.9%, Indie 4.2%
- #51 Strain Tactics
69% 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: Aliens 33.4%, Strategy 23.4%, Sci-fi 14.8%, Action 11.8%, RPG 7.8%
- #52 Alien Death Mob
69% 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: Aliens 30.2%, Shooter 23.6%, Arcade 16.6%, Action 13%, Sci-fi 10%
- #53 Defend Earth: Xenos Survivors
68% 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 43.4%, Sci-fi 21%, RPG 12.6%, Action 8.4%, 3D 5.6%
- #54 Future War Tactics: SOF vs Alien Invasion – Turn-Based Strategy
66% 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: Aliens 44.9%, Strategy 26.1%, Tactical 16.2%, 3D 6.8%, Indie 2.4%
- #55 The Last Tower
70% matchMixed41% of 64 reviews2018
Dev: SalsawiPub: Salsawi Games
Windows
Median: 6 minMean: 8.6 hrs≥1hr: 11%
The Last Tower is an Arcade tower defense infinite runner game, your job is to prevent the invading alien armies from destroying mankinds last stronghold, the goal of The Last Tower is to get the highest score possible
Why similar: Strategy 50.6%, Action 30.5%, Indie 18.9%
- #56 UFO: Aftermath
68% 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 28%, Aliens 26.8%, Tactical 20.7%, Sci-fi 11.4%, Space 10.6%
- #57 Desperate Place
65% 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 27.8%, Base Building 18.6%, Space 16.2%, Shooter 13%, Sci-fi 10.9%
- #58 Sleep Tight
68% matchVery Positive87% of 69 reviews2018
Dev: We Are Fuzzy
Windows
Sleep Tight is an adrenaline pumping arcade-style, twin-stick shooter with base-building elements and wrapped in blankets of nostalgia. Construct your strongest pillow fort during the day to defend your bedroom from endless hordes of monsters each night.
Why similar: Tower Defense 35.9%, Strategy 22.7%, Shooter 20.5%, Action 12.5%, Indie 8.4%
- #59 Xeno Command
66% matchVery Positive84% of 55 reviews2022
Dev: ChillyRoomPub: ChillyRoom
Windows
Defend galaxy against Alien invasion in the RTS offline game with roguelike fun
Why similar: Tower Defense 30.2%, Aliens 19.3%, Base Building 17.1%, Space 13.5%, Strategy 9.3%