Single-player games like Astronaut Assault
Below are 8 single-player Steam games similar to Astronaut Assault, 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 Astronaut Assault page.
Ranked picks
- 1
Block Fortress 2
Single-player alternative to Astronaut Assault — playable solo, no multiplayer required. Shares Action and Strategy with Astronaut Assault.
Choose a planet, build your fortress, and prepare for war. Arm yourself with powerful weapons, deploy troops, and defend your stronghold against relentless attacks. In this action-packed block-builder, survival is earned, and only the strongest will remain.
- 2
Blood Waves
Single-player alternative to Astronaut Assault — playable solo, no multiplayer required. Shares Action and Strategy with Astronaut Assault.
Hardcore and bloody shooter where you will have to repel the attacks of the living dead using the destroying traps, defensive barricades and also weapon of close and long-range combat.
- 3
Mars or Die!
Single-player alternative to Astronaut Assault — playable solo, no multiplayer required. Shares Action and Strategy with Astronaut Assault.
Control two characters simultaneously! Survive, gather, collect upgrades, fight all sizes of one-eyed Martians, build defensible outposts and conquer Mars, in this glorious mix between roguelite and tower defense.
- 4
The Riftbreaker
Single-player alternative to Astronaut Assault — playable solo, no multiplayer required. Shares Action and Strategy with Astronaut Assault.
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.
- 5
Star Control III
Single-player alternative to Astronaut Assault — playable solo, no multiplayer required. Shares Action and Strategy with Astronaut Assault.
The universe is on the brink of destruction. It’s up to you to embark on an epic adventure of strategy and diplomacy to save thousands of worlds from total annihilation. But no pressure, right?
- 6
Castle Craft
Single-player alternative to Astronaut Assault — playable solo, no multiplayer required. Shares Action and Strategy with Astronaut Assault.
Will your castle survive the relentless onslaught, or collapse under pressure? Build, manage resources, and outsmart your foes in a world where everything can be destroyed. Use strategy and creativity to turn the chaos into your greatest advantage!
- 7
Dig or Die
Single-player alternative to Astronaut Assault — playable solo, no multiplayer required. Shares Action and Strategy with Astronaut Assault.
Crash land on a hostile planet where you'll have to build the strongest defenses if you wish to live to escape from it. But be warned... this planet is merciless. Build strong, and smart; else physics may flood or destroy your only hopes of survival.
- 8
Space Haven
Single-player alternative to Astronaut Assault — playable solo, no multiplayer required. Shares Strategy and Indie with Astronaut Assault.
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.