Single-player games like Outer Space Shack
Below are 8 single-player Steam games similar to Outer Space Shack, 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 Outer Space Shack page.
Ranked picks
- 1
Surviving Mars
Single-player alternative to Outer Space Shack — playable solo, no multiplayer required. Shares Strategy and Simulation with Outer Space Shack.
There will be challenges to overcome. Execute your strategy and improve your colony’s chances of survival while unlocking the mysteries of this alien world. Are you ready? Mars is waiting for you.
- 2
Stellar Settlers: Space Base Builder
Single-player alternative to Outer Space Shack — playable solo, no multiplayer required. Shares Strategy and Simulation with Outer Space Shack.
Stellar Settlers is a chill space base/city builder and colony sim game. With unique vertical and horizontal base-building gameplay, settle on 10 hostile alien planets and build your own thriving colony. Get enough materials to build a physics-based Spaceship and try to escape from disasters.
- 3
Judgment: Apocalypse Survival Simulation
Single-player alternative to Outer Space Shack — playable solo, no multiplayer required. Shares Strategy and Simulation with Outer Space Shack.
Build, scavenge, craft, and perform occult rituals to survive in a demon-infested, post-apocalyptic colony simulation. Will you survive Judgment day?
- 4
Timberborn
Single-player alternative to Outer Space Shack — playable solo, no multiplayer required. Shares Strategy and Simulation with Outer Space Shack.
Humans are long gone. In a world struck by droughts and toxic waste, will your lumberpunk beavers do any better? A sandbox city-building game featuring ingenious animals, vertical architecture, water physics, and terraforming. Contains high amounts of wood.
- 5
Space Haven
Single-player alternative to Outer Space Shack — playable solo, no multiplayer required. Shares Strategy and Simulation with Outer Space Shack.
Embark on a space voyage with your ragtag crew of civilians in search of a new home. Build spaceships tile by tile, create optimal gas conditions, manage the needs and moods of their crew, encounter other space-faring groups, and explore the universe in this spaceship colony simulation.
- 6
RimWorld
Single-player alternative to Outer Space Shack — playable solo, no multiplayer required. Shares Strategy and Simulation with Outer Space Shack.
A sci-fi colony sim driven by an intelligent AI storyteller. Generates stories by simulating psychology, ecology, gunplay, melee combat, climate, biomes, diplomacy, interpersonal relationships, art, medicine, trade, and more.
- 7
Dwarf Fortress
Single-player alternative to Outer Space Shack — playable solo, no multiplayer required. Shares Strategy and Simulation with Outer Space Shack.
Build a fortress and try to help your dwarves survive against a deeply generated world. Keep your dwarves happy, grow their community and beware of digging too deeply. The deepest, most intricate simulation of a world that's ever been created.
- 8
Take On Mars
Single-player alternative to Outer Space Shack — playable solo, no multiplayer required. Shares Simulation with Outer Space Shack.
Take On Mars places you right in the middle of mankind’s most exciting undertaking. Start out in the seat of a rover operator, finish as the first human to have ever set foot on the Red Planet.