Single-player games like Astra Protocol 2
Below are 8 single-player Steam games similar to Astra Protocol 2, 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 Astra Protocol 2 page.
Ranked picks
- 1
Space Travellers
Single-player alternative to Astra Protocol 2 — playable solo, no multiplayer required. Shares Action and Strategy with Astra Protocol 2.
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!
- 2
StarDune
Single-player alternative to Astra Protocol 2 — playable solo, no multiplayer required. Shares Adventure with Astra Protocol 2.
Build, Fly, and Survive. StarDune combines tactile, modular construction with seamless space travel. Reshape vibrant voxel planets, automate your outposts, and explore a procedurally generated solar system alone or with friends in a world that’s yours to mold.
- 3
VOID PROFIT
Single-player alternative to Astra Protocol 2 — playable solo, no multiplayer required. Shares Strategy and Simulation with Astra Protocol 2.
Fly a rented ship in a procedurally-generated universe, navigate risky routes, and profit from changing markets before the opportunity disappears and you lose it all. Take jobs, navigate the markets, smuggle, lie. Do everything in order to keep flying.
- 4
No Man's Sky
Single-player alternative to Astra Protocol 2 — playable solo, no multiplayer required. Shares Action and Adventure with Astra Protocol 2.
No Man's Sky is a game about exploration and survival in an infinite procedurally generated universe.
- 5
Star Explorers
Single-player alternative to Astra Protocol 2 — playable solo, no multiplayer required. Shares Action and Adventure with Astra Protocol 2.
Planets, aliens, resources, upgrades, caves, mapping & documenting star systems ... seek a new home for the human race. An all-inclusive (admittedly janky) procedural space-sim made by solo developer Schmidt Workshops.
- 6
ΔV: Rings of Saturn
Single-player alternative to Astra Protocol 2 — playable solo, no multiplayer required. Shares Action and Simulation with Astra Protocol 2.
A physics-based mining sim, set in the thickest debris field in Sol. Every action has a reaction, lasers are invisible without a medium, and your thrust is a potent weapon. Find trade, adapt your equipment to your playstyle, hire a crew to help. Unravel the mysteries of the rings, or just get rich.
- 7
Drifter
Single-player alternative to Astra Protocol 2 — playable solo, no multiplayer required. Shares Action and Simulation with Astra Protocol 2.
Drifter is an open-world sandbox space trading game with a procedurally-generated galaxy 100,000 light years across made up of tens of thousands of star systems to explore and features an original soundtrack by composer Danny Baranowsky.
- 8
Star Shelter
Single-player alternative to Astra Protocol 2 — playable solo, no multiplayer required. Shares Action and Adventure with Astra Protocol 2.
Star shelter is a space survival game built from the ground up for VR. You are stranded in space, you must climb around in Zero-G, explore, scavenge, craft, hack and fight to survive. You have to build, arm and upgrade your own space station in order to escape the cosmic graveyard.