Single-player games like Galactic Simulator 3
Below are 13 single-player Steam games similar to Galactic Simulator 3, 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 Galactic Simulator 3 page.
Ranked picks
- 1
My Little Cosmos
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Indie and Simulation with Galactic Simulator 3.
My Little Cosmos is a light idle clicker game that runs quietly in the background. Keyboard input and mouse clicks from everyday computer use automatically drive the evolution of a universe, with inventory rewards dropping over time.
- 2
Galactic Simulator
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Indie and Simulation with Galactic Simulator 3.
Galactic Simulator is a clicker game based on the Fermi Paradox and the Great Filter theory. Players can simulate the evolution of celestial bodies and civilizations in the galaxy from an observer's perspective. The game supports multiplayer mode. Create a unique galaxy with friends!
- 3
A Game About Getting Bigger
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Indie and Simulation with Galactic Simulator 3.
A Game About Getting Bigger is a loot-driven incremental game about feeding a growing black hole. Destroy celestial bodies to make the black hole at the center grow larger and larger.
- 4
Inspiral: Echoes of Gravity
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Strategy and Indie with Galactic Simulator 3.
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.
- 5
Space Travellers
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Strategy and Indie with Galactic Simulator 3.
Space Travellers is a unique open-world sandbox space simulator set in the year 2343. Travel the galaxy, trade, explore unexplored worlds, fight, build bases and factories, forge alliances and experience new adventures!
- 6
Periapsis: Gravity Slingshot
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Strategy and Indie with Galactic Simulator 3.
Lead humanity’s final journey beyond Earth. Launch ships, harness gravity slingshots, and explore distant star systems to make humanity multi-planetary.
- 7
Starship Simulator
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Simulation with Galactic Simulator 3.
Explore a scientifically accurate Milky Way galaxy and discover distant uncharted worlds, while having unrestricted access to every deck of your Magellan Class deep space exploration vessel. Interact with numerous fully simulated ship systems, or simply relax in the bar and watch the stars drift by.
- 8
Aeons Odyssey
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Strategy and Simulation with Galactic Simulator 3.
An idle management game where you craft equipment, found colonies, collect ships and manage an interstellar economy with fellow captains online. Your autopilot will do the tedious work of scanning planets, you focus on decisions. Includes an optional companion mode to keep track of your progress.
- 9
Halley Mission: 2061
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Strategy and Indie with Galactic Simulator 3.
Embark on a sci-fi survival adventure on Halley's Comet as a retired astronaut on a top-secret mission. Build, manage limited resources, and survive the desolate space environment to complete your mission.
- 10
Galactic Simulator2: Stargate
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Strategy and Indie with Galactic Simulator 3.
Galactic Simulator 2: Stargate is a roguelite simulation game inspired by the Fermi Paradox and the Great Filter. Pilot your ship, gather resources, build stargates, and discover other civilizations as you explore an ever-evolving galaxy.
- 11
Neuter Master
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Strategy and Indie with Galactic Simulator 3.
A lighthearted roguelite breeding game where you match animals on a customizable grid, earn gold with slot-machine-style combos, and balance breeding, sterilizing, and upgrades to keep your herd thriving year after year.
- 12
Idle Sailor
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Strategy and Simulation with Galactic Simulator 3.
Idle Sailor is a relaxing idle adventure where you sail between world destinations, livestream your journey, capture underwater photos of unique fish, and unlock upgrades to make each voyage faster and more rewarding.
- 13
Stellar Industrialist
Single-player alternative to Galactic Simulator 3 — playable solo, no multiplayer required. Shares Strategy and Simulation with Galactic Simulator 3.
You are neither a general nor a soldier — you are a Stellar Industrialist. To you, peace is nothing but shutdowns and losses. Venture to the frontlines, strip battlefields for wreckage and salvage, turn spoils into resources, and expand your interstellar arms empire.