Single-player games like Cosmic Outpost
Below are 8 single-player Steam games similar to Cosmic Outpost, 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 Cosmic Outpost page.
Ranked picks
- 1
Stelvyr: Colony Defense
Single-player alternative to Cosmic Outpost — playable solo, no multiplayer required. Shares Strategy and Indie with Cosmic Outpost.
Build and defend a space colony where every unit of power and every crew assignment matters. Expand production, research new technologies, shape the battlefield with walls and weapons, and adapt your strategy against alien swarms across nine campaign operations.
- 2
Star Hammer: The Vanguard Prophecy
Single-player alternative to Cosmic Outpost — playable solo, no multiplayer required. Shares Strategy and Simulation with Cosmic Outpost.
Take command of Naval Strike Group 7 and lead your fleet to victory in full 3D tactical space combat. Star Hammer: The Vanguard Prophecy is a sci-fi strategy saga that will test your skills as both capital assault ship Captain and naval fleet Commander.
- 3
Planetiles
Single-player alternative to Cosmic Outpost — playable solo, no multiplayer required. Shares Strategy and Indie with Cosmic Outpost.
Dive into Planetiles, where strategy and creativity converge. Build and transform barren planets into flourishing worlds. Outwit natural disasters, develop vibrant habitats, and navigate complex challenges. Embrace a boardgame-like depth with thoughtful planning and strategic decision-making.
- 4
Xenonauts
Single-player alternative to Cosmic Outpost — playable solo, no multiplayer required. Shares Strategy and Indie with Cosmic Outpost.
Xenonauts is a strategy game in which you control a multi-national military organisation defending a Cold War-era Earth from alien invasion, using small squads of persistent soldiers to eliminate the extraterrestrials and recover their technology in turn-based ground combat.
- 5
Aven Colony
Single-player alternative to Cosmic Outpost — playable solo, no multiplayer required. Shares Strategy and Indie with Cosmic Outpost.
Build a new home for humanity in Aven Colony. Discover Aven Prime - an alien planet of deserts, tundras, and wetlands light years from earth. Build your colonies into massive, sprawling cities whilst dealing with the challenges faced when settling on a new world.
- 6
The Universim
Single-player alternative to Cosmic Outpost — playable solo, no multiplayer required. Shares Strategy and Indie with Cosmic Outpost.
Jump straight into managing your own planets as you guide a civilization through the ages. Build the ultimate empire in The Universim, a new breed of God Game in development by Crytivo.
- 7
Refactor
Single-player alternative to Cosmic Outpost — playable solo, no multiplayer required. Shares Strategy with Cosmic Outpost.
Refactor is a hard-core tower defense game that combines modular building, route planning, and element composition.
- 8
The Last Federation
Single-player alternative to Cosmic Outpost — playable solo, no multiplayer required. Shares Strategy and Indie with Cosmic Outpost.
From the creators of AI War: Fleet Command comes an all-new grand strategy title with turn-based tactical combat, set in a deep simulation of an entire solar system and its billions of inhabitants. You are the last of a murdered race, determined to unify or destroy the 8 others.