Single-player games like Iron Marines Invasion
Below are 17 single-player Steam games similar to Iron Marines Invasion, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Iron Marines Invasion page.
Ranked picks
- 1
SYNCHRONIZERS: UNDEAD MARINES
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Action and Strategy with Iron Marines Invasion.
"SYNCHRONIZERS: UNDEAD MARINES" blends high-quality Three-Lane Tower Defense with Reverse Tower Defense gameplay. Command your units in a thrilling narrative reminiscent of a StarCraft and Plants Vs. Zombies fusion! Your choices will forge the path to victory—or defeat.
- 2
Grey Galactic
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Action and Strategy with Iron Marines Invasion.
Grey Galactic is a real time strategy game in space where you build up your planets and ships to conquer your enemies. Develop your empire and fleet of spaceships to destroy your enemies and take over the galaxy! Do you have what it takes to become the best Fleet Captain the UFMC has ever seen?
- 3
IRON GUARD (Non VR)
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Action and Strategy with Iron Marines Invasion.
A sci-fi Tower Defense game. Strategize to destroy waves of rogue robots and assist the powerful turrets with player controlled drone. Build and collect resources and help evacuate your crew from the alien planet.
- 4
Eternal Starlight VR
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Action and Strategy with Iron Marines Invasion.
Activate your Neural Link to gain an omniscient view of the battlefield. Experience the conflict at any scale, as you plot the course that will lead your fleet to victory. Eternal Starlight is a tactical space combat game, built from the ground up for VR.
- 5
Iron Marines
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Action and Strategy with Iron Marines Invasion.
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!
- 6
Door Kickers 2: Task Force North
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Action and Strategy with Iron Marines Invasion.
Command military Special Ops Teams in gripping tactical combat against a Middle East-based terrorist network. Sequel to RockPaperShotgun's "Best Tactics Game of 2014".
- 7
Aliens: Dark Descent
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Action and Strategy with Iron Marines Invasion.
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.
- 8
Line Of Defense Tactics - Tactical Advantage
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Action and Strategy with Iron Marines Invasion.
A real-time strategy combat game based on the world of the Line Of Defense. Command a team of four Galactic Command marines in highly classified missions in space and on planets.
- 9
SC2VN - The eSports Visual Novel
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Indie with Iron Marines Invasion.
SC2VN is a visual novel about the South Korean StarCraft 2 scene. You play as Mach, a foreign semi-pro trying to make it in eSports who soon learns that success in StarCraft takes more than in-game strategy.
- 10
Mini World: CREATA
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required.
Mini World is a 3D free sandbox game about adventure, exploration, and creating your dream worlds. There is no grinding or leveling up. No IAP gate that locks features from free to play players. Everyone can enjoy the game’s full features with great freedom
- 11
Plants vs. Zombies™: Replanted
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Strategy with Iron Marines Invasion.
The classic Plants vs. Zombies returns in glorious HD! The original battle between Plants and Zombies is back — bigger, brighter, and crazier than ever before! Experience the game that started it all, now remastered with stunning HD graphics and packed with new secrets and content to uncover.
- 12
Kingdom Rush - Tower Defense
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Strategy with Iron Marines Invasion.
Get ready for an epic journey to defend your kingdom against hordes of orcs, trolls, evil wizards and other nasty fiends using a vast arsenal of towers and spells at your command!Fight on forests, mountains and wastelands, customizing your defensive strategy with different tower upgrades and specializations!
- 13
Kingdom Rush 5: Alliance TD
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Strategy and Indie with Iron Marines Invasion.
While a formidable evil emerges, an unexpected alliance is taking shape! It will take the finest warriors of Linirea and the relentless Dark Army to stop it. Beware! Though they may journey side by side the ever-changing winds of fate could swiftly alter their course.
- 14
Kingdom Rush Frontiers - Tower Defense
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Strategy with Iron Marines Invasion.
Command your troops through an epic (mis)adventure as you defend exotic lands from dragons, man-eating plants, and ghastly denizens of the underworld -all with flashy new towers, levels, heroes, and more goodies to help you crush your foes in this Fantasy Action Tower Defense game!
- 15
Kingdom Rush Vengeance - Tower Defense
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Strategy with Iron Marines Invasion.
It's payback time! Lead your mighty dark army and make the Kingdom tremble with every step. Build powerful towers, choose your arsenal for destruction, and find the deadliest combination - train legendary heroes and lead them to victory!
- 16
Kingdom Rush Origins - Tower Defense
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Strategy and Indie with Iron Marines Invasion.
Command your elven army and defend mystical lands from sea serpents, evil sorcerers, and wave after wave of gnoll tribesman, all with the help of brand-spankin’ new towers, heroes, and spells to fend off every last baddie.
- 17
Legends of Kingdom Rush
Single-player alternative to Iron Marines Invasion — playable solo, no multiplayer required. Shares Strategy and Indie with Iron Marines Invasion.
RPG turn-based combat game with deep tactics and bad jokes! Do you have what it takes to save the kingdom?