Single-player games like BossConstructor
Below are 14 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
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.
- 2
Nimbatus - The Space Drone Constructor
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and Indie with BossConstructor.
Command the Nimbatus and craft drones out of hundreds of different parts. Survive unknown threats in a fully destructible, procedural universe, compete against other players in different arenas or enjoy complete creative freedom in the sandbox.
- 3
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.
- 4
Space Pirates And Zombies 2
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and Indie with BossConstructor.
Design and then improve the ultimate mothership. Explore a persistent living galaxy populated by 200 unique captains that can do everything you can do. Survive the zombie infection and then fight them back. Make allies and start your own faction. Build your empire. Also includes Sandbox Mode.
- 5
Gratuitous Space Battles
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Indie and Simulation with BossConstructor.
The first ever auto-battler game, from way back in 2009Who needs backstory? Who needs resource-gathering? Diplomacy is so last year. Gratuitous Space Battles cuts right to the chase of sci-fi strategy games, and deals with large, completely unjustified space battles between huge opposing space fleets.
- 6
Rebel Galaxy Outlaw
Single-player alternative to BossConstructor — playable solo, no multiplayer required. Shares Action and Indie with BossConstructor.
Out of cash, out of luck, out on the fringe. Juno Markev has a killer to tail, a debt to pay, and more trouble headed her way. Rebel Galaxy Outlaw takes place in a greasy, blue-collar world of outlaws, truckers, cops and thieves.
- 7
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.
- 8
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.
- 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
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.
- 14
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.