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Games Like Colony Siege

60+ similar titles based on shared tags and player behavior. Themes include Tower Defense, Strategy, Singleplayer, Indie.

Similar Games

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  1. #1 X-Morph: Defense
    97% 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 47.3%, Strategy 28.7%, Co-op 12.9%, Sci-fi 9.9%, Indie 1.3%

  2. #2 DG2: Defense Grid 2
    96% matchVery Positive86% of 3,339 reviews2014
    Dev: Hidden Path Entertainment
    Windows
    Median: 6.0 hrsMean: 11.4 hrs≥1hr: 89%

    Great strategy is timeless. Build, adapt, and defend across dynamic maps, solo or online - every session brings new strategies, new solutions, and new surprises. Now is the perfect time to enter the grid.

    Why similar: Tower Defense 26.3%, Strategy 19.6%, RTS 17.6%, Co-op 9.6%, Sci-fi 8.6%

  3. #3 Siege of Centauri
    96% matchMixed66% of 448 reviews2019
    Dev: Stardock Entertainment
    Windows
    Median: 42 minMean: 6.0 hrs≥1hr: 44%

    Defend against thousands of enemies in this explosive tower defense game. Deploy upgradable towers and unleash powerful orbital abilities as you try to protect Earth's first colony world from destruction.

    Why similar: Tower Defense 34.3%, Strategy 23.9%, Real-Time 23%, Base Building 10%, Sci-fi 8.8%

  4. #4 The Riftbreaker
    94% 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 26.2%, Strategy 15.1%, RTS 15%, Co-op Campaign 11.4%, Base Building 11.2%

  5. #5 Defense Task Force - Sci Fi Tower Defense
    94% 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 38.5%, Strategy 32.3%, Simulation 19.3%, Sci-fi 8.3%, Indie 1.6%

  6. #6 They Are Billions
    92% 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: Strategy 26.7%, Tower Defense 26.5%, RTS 23%, Base Building 16.7%, Survival 6.5%

  7. #7 Conan Unconquered
    93% matchMixed68% of 1,848 reviews2019
    Dev: PetroglyphPub: Funcom
    Windows
    Median: 4.0 hrsMean: 6.9 hrs≥1hr: 85%

    From the Command & Conquer veterans at Petroglyph comes the first ever survival RTS set in the savage world of Conan the Barbarian. Play solo or team up in multiplayer in Conan Unconquered’s action-packed co-op Mode where you build a shared stronghold and fend off the hordes together.

    Why similar: Strategy 35.5%, RTS 19.2%, Tower Defense 14.2%, Simulation 9.2%, Co-op 9.1%

  8. #8 Tower Dominion
    91% 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 37.6%, Strategy 25%, RTS 21.1%, Base Building 10.7%, Sci-fi 5.6%

  9. #9 Element TD 2 - Tower Defense
    91% matchVery Positive90% of 3,152 reviews2021
    Dev: Element Studios
    Windows
    Median: 3.3 hrsMean: 13.2 hrs≥1hr: 76%

    Element TD 2 sees you combine powerful elements to create unique towers. Prove your defenses against challenging foes, and compete or cooperate with others to determine who has mastered the elements.

    Why similar: Tower Defense 36.9%, Strategy 23.8%, RTS 18.5%, Co-op 9%, Online Co-Op 6%

  10. #10 Creeper World 3: Arc Eternal
    90% matchOverwhelmingly Positive96% of 4,761 reviews2014
    Dev: Knuckle Cracker
    Windows · Mac · Linux
    Median: 7.4 hrsMean: 77.0 hrs≥1hr: 78%

    Creeper World 3 is what happens when cellular automata takes over a strategy simulation. Instead of discrete units that attack your base, a fluid-like substance spreads over the terraformable terrain. Your base, your weapons, your strategy... you must adapt them all.

    Why similar: Tower Defense 50.7%, Strategy 23.3%, RTS 11.2%, Sci-fi 4.9%, Simulation 4.7%

  11. #11 2112TD: Tower Defense Survival
    89% 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 45%, Strategy 32.8%, Sci-fi 14.2%, Survival 8.1%

  12. #12 TDS - Tower Defense Strategy
    88% 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 32.6%, RTS 23%, Co-op 13.8%, Strategy 11.1%, Online Co-Op 8.1%

  13. #13 Defense Grid: The Awakening
    89% 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 65.3%, Strategy 26.1%, Sci-fi 7.8%, Indie 0.9%

  14. #14 Outpost: Infinity Siege
    87% matchMixed66% of 13,528 reviews2024
    Dev: Team RangerPub: Lightning Games
    Windows
    Median: 16.2 hrsMean: 41.5 hrs≥1hr: 91%

    Command Mobile Outpost and take XEN Firearm to venture deep into the Signet surveillance off-limit area. Collect unique Weapon Units. Amp up the firepower of the Outpost that fights with you. This is an FTD game - FPS, Tower Defense, Base Building and much more all at the same time.

    Why similar: Tower Defense 28.4%, Strategy 19.3%, RTS 17.2%, Co-op 12.1%, Base Building 9.7%

  15. #15 Age of Darkness: Final Stand
    86% matchMostly Positive75% of 10,403 reviews2025
    Dev: PlaySide
    Windows
    Median: 5.5 hrsMean: 13.6 hrs≥1hr: 83%

    Age of Darkness: Final Stand is a dark fantasy survival RTS where you must illuminate, build and defend humanity’s last bastion against hordes of Nightmares. Set in the remnants of a kingdom consumed by a deadly fog, you decide. Will you hide in the light? Or take back your world.

    Why similar: Tower Defense 29.6%, Strategy 21.6%, RTS 20.9%, Co-op 9.8%, Base Building 9.6%

  16. #16 No Creeps Were Harmed TD
    85% 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 41%, Strategy 27.4%, Sci-fi 11.5%, Online Co-Op 10.5%, Survival 5.3%

  17. #17 Warstone TD
    86% matchVery Positive83% of 3,869 reviews2018
    Dev: Battlecruiser Games
    Windows · Mac · Linux
    Median: 4.6 hrsMean: 8.5 hrs≥1hr: 89%

    Warstone is a Tower Defense game, with RPG, Strategy, and even city building elements. Detailed Hi-res graphics and beautiful illustrations combine with a deep storyline to draw you into the world.

    Why similar: Tower Defense 45.7%, Strategy 32%, Co-op 9.4%, RTS 8.9%, Multiplayer 2.6%

  18. #18 Taur
    84% matchMostly Positive80% of 2,078 reviews2020
    Dev: Echo Entertainment
    Windows
    Median: 4.2 hrsMean: 6.8 hrs≥1hr: 76%

    Taur is an action-strategy sci-fi game. Control the Prime Cannon and unlock all of its powerful weapons and abilities. Build turrets, droids, aircraft and more as you fight to protect the homeworld of the Tauron droids against a relentless invasion. Will your Taur stand against the Imperion warmachine?

    Why similar: Tower Defense 41.5%, Strategy 29%, RTS 12.7%, Base Building 8.7%, Sci-fi 7.1%

  19. #19 Particle Fleet: Emergence
    83% matchVery Positive92% of 1,261 reviews2016
    Dev: Knuckle Cracker
    Windows · Mac · Linux
    Median: 6.7 hrsMean: 24.9 hrs≥1hr: 76%

    Build and design your own fleets and stand opposed to the Particulate in this physics/strategy/RTS/fleet hybrid. Build partially destructible and self repairing ships that interact with enemies less controlled by some scripted logic and more driven by a real time massive physics particle simulation.

    Why similar: Strategy 41.9%, Simulation 21.5%, RTS 19.4%, Tower Defense 9.5%, Sci-fi 5.9%

  20. #20 Harvest: Massive Encounter
    84% 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 48.8%, Strategy 42.6%, Sci-fi 6.6%, Indie 2%

  21. #21 MarZ: Tactical Base Defense
    82% matchMostly Positive78% of 885 reviews2019
    Dev: Giant Grey
    Windows
    Median: 2.5 hrsMean: 5.5 hrs≥1hr: 71%

    Build your defense base to fight back the undead hordes of Mars and secure the future of the red planet. MarZ is a game of strategy and tactical defense where you must carefully manage your crew and resources as you try to uncover the terrible secrets of the undead.

    Why similar: Tower Defense 36%, Strategy 28.9%, RTS 20.7%, Base Building 7.4%, Sci-fi 6%

  22. #22 Infested Planet
    82% 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 37.8%, Tower Defense 32.9%, RTS 21.2%, Sci-fi 7%, Indie 1.1%

  23. #23 Arrival of Beasts
    81% matchPositive96% of 52 reviews2023
    Dev: FreeTimeDevelopment
    Windows

    Discover one of the hardest tower defense games with strategic elements, individual gameplay and challenging mechanics. Play together with your friends in co-op mode, create a team and compete with other players in the online ranking.

    Why similar: Tower Defense 33.2%, Strategy 27%, RTS 19.4%, Base Building 7.9%, Co-op 5.7%

  24. #24 Axon TD: Uprising - Tower Defense
    80% matchVery Positive87% of 722 reviews2024
    Dev: Element Studios
    Windows
    Median: 3.6 hrsMean: 9.8 hrs≥1hr: 75%

    Axon TD lets you expand the map boundaries themselves. A huge arsenal of towers and a wide variety of enemies clash in a battlefield that grows to your whims. Engage in single, cooperative, and roguelite gameplay.

    Why similar: Tower Defense 31.7%, Strategy 21.3%, RTS 18.5%, Co-op 8.3%, Online Co-Op 8.3%

  25. #25 Protolife
    81% 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%, Strategy 23.3%, RTS 22.9%, Base Building 10.4%, Sci-fi 9.1%

  26. #26 Stellarcraft
    78% 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: Strategy 21.1%, Co-op Campaign 19.2%, RTS 13.5%, Co-op 11.4%, Online Co-Op 9%

  27. #27 HYPERNOVA: Escape from Hadea
    79% matchVery Positive80% of 82 reviews2017
    Dev: ActaLogic
    Windows · Mac · Linux

    A colorful but challenging blend of classic RTS and tower defense. Build, expand, research, and defend your alien colony as you race to construct a teleportation device and escape a dying star.

    Why similar: Tower Defense 27.6%, Real-Time 19.1%, Strategy 18.9%, RTS 18.4%, Base Building 7.5%

  28. #28 EverSiege: Untold Ages
    76% matchMostly Positive73% of 801 reviews2026
    Dev: Tindalos InteractivePub: Dear Villagers
    Windows

    Retreating ends here. Defend Bastion against evil hordes, reclaim lost powers, rebuild ancient ruins, and adapt your tactics to reverse the siege. Shape your playstyle in this hero-strategy rogue-lite solo or co-op up to 3 players.

    Why similar: Tower Defense 29.2%, Strategy 21.8%, RTS 19.9%, Co-op 13.8%, Online Co-Op 9.5%

  29. #29 REDCON
    77% matchVery Positive85% of 807 reviews2016
    Dev: Hexage
    Windows
    Median: 4.0 hrsMean: 9.8 hrs≥1hr: 71%

    Command your own fortress in FTL-like real-time battles! Crush the enemy fortress with unrelenting bombardment or seize it with carefully executed invasion.

    Why similar: Strategy 45.1%, Tower Defense 28.3%, Simulation 16.5%, Base Building 8.3%, Indie 1.7%

  30. #30 Rush for Glory
    78% 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 55.3%, Strategy 44.7%

  31. #31 Operation: New Earth
    77% 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 63%, Simulation 19.5%, Sci-fi 10.7%, Multiplayer 4.3%, Survival 2.5%

  32. #32 Sanctum 2
    74% 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 50.9%, Strategy 19.6%, Co-op 13.5%, Sci-fi 5.8%, Online Co-Op 5.7%

  33. #33 Legion TD 2 - Multiplayer Tower Defense
    73% matchVery Positive86% of 14,799 reviews2021
    Dev: AutoAttack Games
    Windows · Mac
    Median: 11.6 hrsMean: 42.5 hrs≥1hr: 89%

    An infinitely replayable multiplayer and single-player tower defense. Defend against waves of enemies and destroy the enemy's king before they destroy yours. Legion TD 2 is a one-of-a-kind game of tactics, teamwork, and prediction. Party as 1-8 players.

    Why similar: Tower Defense 36.7%, Strategy 22.2%, Co-op 10.5%, Online Co-Op 8%, Base Building 7.4%

  34. #34 Fortified
    75% 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: Tower Defense 44.9%, Strategy 25.4%, Co-op 16%, Sci-fi 5.1%, Multiplayer 3.8%

  35. #35 Expand & Exterminate: Terrytorial Disputes - Endless Base Defense
    74% matchVery Positive81% of 58 reviews2023
    Dev: Terryble Interactive
    Windows

    The best elements of Real-Time Strategy (RTS) and Tower Defense genres combined into a new Base Defense game. Defend against countless waves of enemies while you expand your base, gather resources, and research technologies to defeat the ever strengthening enemy units.

    Why similar: Tower Defense 38.7%, Strategy 27%, RTS 26%, Base Building 8.3%

  36. #36 Project Astra Dominium
    73% 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 38.2%, Strategy 24.5%, Simulation 14.3%, Base Building 12.2%, Sci-fi 9.3%

  37. #37 From Glory To Goo
    71% matchOverwhelmingly Positive97% of 1,455 reviews2024
    Dev: Stratagem Blue
    Windows
    Median: 4.0 hrsMean: 16.4 hrs≥1hr: 69%

    From Glory To Goo is a Sci-Fi survival RTS set on an alien world. Serve as humanity's bulwark by establishing a colony and supporting your colonists still in orbit. But beware, for The Goo, a relentless and shape-shifting force approaches from all sides, even above and below.

    Why similar: Tower Defense 31.6%, RTS 22.6%, Strategy 20.2%, Base Building 11.1%, Simulation 9.6%

  38. #38 Anomaly Defenders
    75% 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 51.5%, Strategy 43.2%, Sci-fi 3.6%, Indie 1.6%

  39. #39 Creeper World 4
    72% matchVery Positive95% of 4,620 reviews2020
    Dev: Knuckle Cracker
    Windows
    Median: 12.2 hrsMean: 29.4 hrs≥1hr: 88%

    The unstoppable fluid enemy has returned and destroyed every world in its path! Defend against Creeper as it floods across the 3D terrain in this real time strategy game where the enemy is a fluid.

    Why similar: Tower Defense 33%, Strategy 22.1%, RTS 21.8%, Simulation 12.2%, Sci-fi 7.9%

  40. #40 Band of Defenders
    76% matchMixed50% of 396 reviews2018
    Dev: Alda Games
    Windows
    Median: 3.3 hrsMean: 9.9 hrs≥1hr: 89%

    A Co-Op FPS game with base building in a post-apocalyptic world. Craft weapons, build barricades and automated turrets, unlock new gear and items for visual customization and kill all savages and mutants trying to destroy the remnants of human civilization.

    Why similar: Tower Defense 34.9%, Real-Time 22.2%, Strategy 22%, Base Building 11.7%, Sci-fi 9.1%

  41. #41 Cataclismo
    69% matchVery Positive89% of 4,077 reviews2025
    Dev: Digital SunPub: Hooded Horse
    Windows
    Median: 4.1 hrsMean: 8.6 hrs≥1hr: 77%

    Design and build fortresses brick by brick to stand against endless hordes of Horrors in this real-time strategy game with resource management, siege defense, and exploration. Lead from the ramparts, push back the darkness, and hold fast against the creatures of the Mist.

    Why similar: Tower Defense 32.4%, Strategy 25.1%, RTS 23.5%, Base Building 11.4%, Survival 6.5%

  42. #42 Here Comes The Swarm
    70% matchVery Positive88% of 161 reviews2026
    Dev: CableHook Games
    Windows

    Here Comes the Swarm is a survival RTS with a pause button! Create your strategy, build, manage, and defend your settlements at your own pace. Take the fight to the hive mind and lead expeditions to deliver a deadly blow and eradicate your foes. Will you reclaim Ulora from the relentless Swarm?

    Why similar: Tower Defense 25.8%, Strategy 23.7%, RTS 21%, Simulation 13.2%, Base Building 10.2%

  43. #43 Revenge of the Titans
    73% matchVery Positive82% of 1,250 reviews2011
    Dev: Puppygames
    Windows · Mac · Linux
    Median: 2.1 hrsMean: 4.4 hrs≥1hr: 82%

    The ultimate mash-up of Real-time Strategy and Tower Defense!

    Why similar: Tower Defense 55%, Strategy 30.8%, Sci-fi 7.4%, RTS 5.5%, Indie 1.4%

  44. #44 Colony Survival
    71% matchVery Positive92% of 8,816 reviews2017
    Dev: Pipliz
    Windows · Mac · Linux
    Median: 9.6 hrsMean: 28.2 hrs≥1hr: 87%

    Colony Survival is a unique first-person strategy game developed by a two-man team. Build your own colony in a voxel world. Command guards, farmers, miners and other colonists. Defend your colony against the horde of monsters that attacks every night!

    Why similar: Strategy 34.6%, Base Building 21.7%, Survival 13.4%, Co-op 11.4%, RTS 9.3%

  45. #45 Alien Marauder
    72% 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%, Strategy 23.7%, RTS 23.4%, Base Building 10.3%, Sci-fi 10.3%

  46. #46 Becastled
    67% matchVery Positive82% of 5,494 reviews2025
    Dev: Mana Potion Studios
    Windows
    Median: 3.5 hrsMean: 6.8 hrs≥1hr: 81%

    Build a castle by day and defend it by night. Becastled blends cozy city-building with challenging tower defense strategy. Lead the Sun Kingdom’s last stand against the Moon Beasts and end the ancient conflict between light and darkness!

    Why similar: Strategy 42.3%, RTS 25.7%, Base Building 20.1%, Tower Defense 8.2%, Survival 3%

  47. #47 Guardians of the Sanctree
    70% matchMostly Positive76% of 368 reviews2024
    Dev: HuCang Studio
    Windows

    You and allies, avian inhabitants of Sanctree City, build structures and production lines on the tree, crafting weapons to fend off subterranean insects. Defense is just the start—dig deeper, destroy nests, fortify new defenses against escalating threats for an impregnable stronghold.

    Why similar: Tower Defense 33.6%, Strategy 21.9%, Simulation 14.3%, Base Building 12.6%, Online Co-Op 11.7%

  48. #48 Radiant Defense
    71% 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 43.4%, Strategy 34.7%, Simulation 14.9%, Sci-fi 5.3%, Indie 1.6%

  49. #49 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 48.9%, Tower Defense 33.1%, RTS 8.3%, Sci-fi 8.2%, Indie 1.4%

  50. #50 Defense Zone
    70% matchVery Positive83% of 83 reviews2014
    Dev: Artem Kotov
    Windows · Mac · Linux

    Stunning detail of levels, in-depth gameplay, finely tuned balance of all levels and turrets. During the game you will hold your defense with your turrets against the massive hordes of enemies.

    Why similar: Tower Defense 53.8%, Strategy 44.2%, Indie 2%

  51. #51 League TD
    67% matchVery Positive87% of 79 reviews2023
    Dev: Wondarabyte
    Windows

    "League Tower Defense" is a strategy tower defense game that combines unique defense towers and various upgradeable components to unleash different attack effects. Come and build your perfect defense line.

    Why similar: Tower Defense 46.4%, Strategy 35%, Sci-fi 11.4%, Base Building 6.9%, Indie 0.2%

  52. #52 Mindustry
    65% matchOverwhelmingly Positive96% of 25,660 reviews2019
    Dev: AnukenDev
    Windows · Mac · Linux
    Median: 4.9 hrsMean: 26.9 hrs≥1hr: 76%

    An open-ended factory management game with RTS and tower defense elements.

    Why similar: Tower Defense 35.1%, Strategy 23.9%, Base Building 13%, RTS 10.4%, Co-op 7.7%

  53. #53 Tower Wars
    68% matchMostly Positive72% of 1,753 reviews2012
    Dev: SuperVillain Studios
    Windows · Mac
    Median: 2.4 hrsMean: 6.8 hrs≥1hr: 88%

    Tower Wars combines elements of tower defense, RTS, and all-out multi-player mayhem to bring you a completely unique experience, delivered with a fun and funny not-so-old world style!

    Why similar: Tower Defense 59.2%, Strategy 27.3%, Co-op 7.1%, Multiplayer 3.8%, Online Co-Op 1.6%

  54. #54 Sentinel 4: Dark Star
    69% matchMostly Positive79% of 63 reviews2015
    Dev: Origin8 Technologies Ltd
    Windows
    Median: 4.1 hrsMean: 4.6 hrs≥1hr: 96%

    Want a tactical and strategic tower defense challenge that's packed with options and upgrades? Take command of the dropship Sentinel and do battle across a vibrant sci-fi world.

    Why similar: Strategy 52.2%, Tower Defense 31.2%, Sci-fi 13.9%, Indie 2.7%

  55. #55 Ultimate Zombie Defense
    65% matchVery Positive85% of 4,653 reviews2020
    Dev: Terror Dog Studio
    Windows · Mac
    Median: 1.9 hrsMean: 8.2 hrs≥1hr: 66%

    Team up or face it alone in this top down zombie slaying defense adventure! Featuring up to 4 player online co-op, cleanse the infected wave by wave and upgrade your base with traps & defenses to build the Ultimate Zombie Defense. Can YOU stop them?

    Why similar: Tower Defense 36.1%, Strategy 21.1%, Online Co-Op 13.3%, Co-op 13.3%, Base Building 5.9%

  56. #56 Fortify
    68% matchMostly Positive74% of 98 reviews2016
    Dev: Holgersson Entertainment
    Windows
    Median: 48 minMean: 6.2 hrs≥1hr: 46%

    Fortify is a real-time strategy game with a tower defense twist. Defend your castle from attacking monsters and siege weapons by using ranged and melee defenders, catapults, cannons, oil fields and more. You start at the iron age, advancing to the medieval age, and later, the imperial age.

    Why similar: Strategy 67.2%, RTS 29.5%, Indie 3.3%

  57. #57 AColony
    65% matchVery Positive89% of 134 reviews2023
    Dev: ZeroTris
    Windows

    A colony building game with an emphasis on unexpected events, online co-op, and managing a unique community. Build your colony, feed your colonists, research technologies, craft advanced weapons, explore the world, fight enemies and defend your property.

    Why similar: Strategy 27.8%, Base Building 17.1%, Online Co-Op 16.6%, Simulation 15.3%, Co-op 13.5%

  58. #58 Zero-K
    65% matchVery Positive94% of 4,227 reviews2018
    Dev: Zero-K Team
    Windows · Linux
    Median: 2.3 hrsMean: 33.5 hrs≥1hr: 67%

    With 100+ truly unique units, Zero-K is an RTS of freedom and creativity, tempered by a decade of refinement. Sculpt land into a castle and throw invaders off it with a Jugglenaut. Explore a massive campaign, solo or co-op. Hop online for epic 32 player battles or fast paced 1v1, on 100s of maps.

    Why similar: Strategy 30%, RTS 25%, Real-Time 14.5%, Simulation 11.6%, Co-op 5.9%

Based on tag similarity + player behavior
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