Single-player games like Coasteroid
Below are 8 single-player Steam games similar to Coasteroid, 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 Coasteroid page.
Ranked picks
- 1
soul Interface
Single-player alternative to Coasteroid — playable solo, no multiplayer required. Shares Indie and Simulation with Coasteroid.
You explore an alien machine, learn to operate it, create virtual organisms, and grow an artificial ecosystem inside it. You design species down to individual atoms and watch them fight for survival. You then send successful species to other players to leech energy from them and power your machine.
- 2
Starship Colony
Single-player alternative to Coasteroid — playable solo, no multiplayer required. Shares Indie and Simulation with Coasteroid.
A deep starship colony sim. Build your starship, manage air, water, food, fuel, energy, temperature and psychology to keep your crew alive across vast distances. Closed-loop system in space. Mining, wiring, plumbing, in-ship factory, (alien?) radio signals & translation, diplomacy, combat, and more.
- 3
Generation Ship
Single-player alternative to Coasteroid — playable solo, no multiplayer required. Shares Simulation with Coasteroid.
As the AI responsible for a Generation Ship, you are humanity's last hope. Build efficient raw material cycles and help your crew in a realistic real-time simulation to survive the challenges of space on their long journey to a new home!
- 4
Marble World
Single-player alternative to Coasteroid — playable solo, no multiplayer required. Shares Indie and Simulation with Coasteroid.
Marble World is a physics sandbox simulator with marbles. Create your own marble races, runs and machines. Customize a variety of tracks, decorations and marbles to create a beautiful world.
- 5
Times of Progress
Single-player alternative to Coasteroid — playable solo, no multiplayer required. Shares Simulation with Coasteroid.
Times of Progress is a City Builder set during the Industrial Revolution. Build industries to extract natural resources. Produce goods to satisfy the population. Manage transportation routes by train and ship. Expand on procedurally generated maps and trade with nearby cities.
- 6
StarShip-DF
Single-player alternative to Coasteroid — playable solo, no multiplayer required. Shares Indie and Simulation with Coasteroid.
Build a 3D multi-layer starship and lead your colonists. Mine resources and salvage wreckage in space, or land to gather supplies on planets. Fight enemies, protect your crew, and build robots for the ultimate mobile base.
- 7
Thveit
Single-player alternative to Coasteroid — playable solo, no multiplayer required. Shares Indie and Simulation with Coasteroid.
Thveit is a cozy Norse settlement builder where changing seasons, ancient beliefs, and folklore creatures shape the fate of your settlements. Guide your settlers, manage resources, and grow a thriving community as humans and mythical beings learn to live side by side.
- 8
Inspiral: Echoes of Gravity
Single-player alternative to Coasteroid — playable solo, no multiplayer required. Shares Indie and Simulation with Coasteroid.
Start as an asteroid, grow by absorbing other celestial bodies to become a planet, a star, and ultimately a black hole. Experience realistic gravity and orbital physics in an ever-evolving sandbox universe.