Single-player games like BossConstructor
Below are 15 single-player Steam games similar to BossConstructor, 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 BossConstructor page.
Ranked picks
- 1
Space Engineers
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and Indie with BossConstructor.
Space Engineers is a sandbox engineering game where you design and build ships, stations, and planetary bases in a fully destructible environment. Explore planets and space, mine resources, survive hazards, and engage in combat alone or with friends in Creative or Survival modes.
- 2
OrbitFix
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Indie and Simulation with BossConstructor.
Inherit a derelict space station on the edge of the galaxy and breathe new life into it. As the ultimate space mechanic, you will repair diverse spaceships, trade with pilots, and expand your services. Start with a single rusty dock and build the most bustling service hub in the sector!
- 3
Orbital Command
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and Indie with BossConstructor.
Orbital Command is about controlling planet based weapon systems to defend your planets from large asteroids and hostile invaders. Will you be able to complete the Dyson Sphere, or will your planets end up barren husks?
- 4
Celestial Command
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and Indie with BossConstructor.
Mine asteroids, salvage space debris, design your own small or massive spacecraft using individual functional components, complete missions, and engage in battles against enemies in a vast galaxy with realistic physics based on orbital mechanics or in a classic physics mode.
- 5
Reassembly
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and Indie with BossConstructor.
A spaceship building and universe-exploration game. Collect resources, expand and grow your fleet, and conquer your personal galaxy. Stellar ambience by Peaks.
- 6
Cosmonator
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and Indie with BossConstructor.
Cosmonator is an 'RPG-em-up': a hybrid of classic fast-paced top-down shoot-em-up action infused with deep character building elements. Build up your own unique alien-killing machine to avenge the destruction of planet Earth!
- 7
Starship EVO
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and Indie with BossConstructor.
Mine and craft your way to orbit, build your own starship and explore a vast, dangerous galaxy alongside your crew. For players who love a meaningful survival progression, a unique and elegant building system, and epic space-opera scale.
- 8
Kerbal Space Program
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Indie and Simulation with BossConstructor.
In Kerbal Space Program, take charge of the space program for the alien race known as the Kerbals. You have access to an array of parts to assemble fully-functional spacecraft that flies (or doesn’t) based on realistic aerodynamic and orbital physics.
- 9
Starcom: Nexus
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and Indie with BossConstructor.
Suddenly thrown into an unknown galaxy, you must explore, fight or befriend aliens and transform your ship from a small survey vessel into a powerful battlecruiser to unravel the mystery of the forces that brought you here and find your way home.
- 10
Mass Effect (2007)
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and RPG with BossConstructor.
As Commander Shepard, you lead an elite squad on a heroic, action-packed adventure throughout the galaxy.
- 11
Mass Effect 2 (2010 Edition)
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares RPG with BossConstructor.
Are you prepared to lose everything to save the galaxy? You'll need to be, Commander Shepard. It's time to bring together your greatest allies and recruit the galaxy's fighting elite to continue the resistance against the invading Reapers.
- 12
Space Pirates and Zombies
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and Indie with BossConstructor.
Explore a randomly generated Galaxy populated with factions, enemies, missions, and items providing you with a unique experience each time you play.
- 13
Avorion
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and Indie with BossConstructor.
A procedural co-op space sandbox where players can build their own space ships out of dynamically scalable blocks. Fight epic space battles, explore, mine, trade, wage wars and build your own empire to save your galaxy from being torn apart by an unknown enemy.
- 14
Kubifaktorium
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Indie and Simulation with BossConstructor.
Build, manage and grow a thriving colony in Kubifaktorium. The game features different biomes to explore, plenty of resources to exploit, complex machinery to build and interesting production chains to master.
- 15
BridgeFix 2=3-1
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Indie with BossConstructor.
BridgeFix 2=3-1 is a beautiful, relaxing and rewarding puzzle game which adds new twists to the game Hashi-wo-kakero. The game is easy to learn, hard to master and offers you plenty of puzzles to solve.