Startopia
A once thriving network of space stations and planets have been left lifeless, redundant scars of the apocalypse.
91% of 845 Steam reviews are positivePlayers online now: 5$6.99
Games like 绛河之上 Under Supernova
Did 绛河之上 Under Supernova leave you in a replayable and retro frame of mind? These games are a good place to start.
Astrobuilder
An AI-driven space management RPG in a living galaxy. Explore 150+ planets and interact with 600+ NPCs whose lives and relationships evolve over time. Trade, run shops, build a Commerce Guild, join Military Factions, govern planets, and command fleets in war. Your every choice reshape the galaxy.
Replayable
88% of 354 Steam reviews are positive$14.99Mercury Fallen
A sci-fi colony management sim with a focus on exploration, expansion, and survival. Rebuild your underground facility, manage colonists and robots, and uncover the mysteries of an alien world light-years from Earth. Dig deep, expand across the surface, and shape your new home.
Replayable, Relaxing
78% of 259 Steam reviews are positivePlayers online now: 2$24.99Eco
A simulated ecosystem, a meteor on a thirty-day collision course, and a whole server of players who have to stop it without wrecking the planet first. Farm, build, trade, pass laws and argue with graphs. Eco is survival crafting where the politics matter as much as the pickaxe.
Also in Co-op · Replayable, Relaxing
80% of 11,415 Steam reviews are positivePlayers online now: 206$29.99Minicology
You have crash-landed into a mini-verse of tiny planets. Welcome to Minicology! Embark on an interstellar survival sandbox journey. Use your crafting, combat, and automation skills to survive the many challenges this mini-verse throws at you.
Replayable, Retro
64% of 53 Steam reviews are positive$14.99Astro Colony
Astro Colony is a relaxed automation game in an endless procedurally generated universe. Build conveyor networks, move and dock your stations, recruit astronauts and research new tech, alone or with friends. No timers, no punishing failure: just you, a growing colony and a galaxy of voxel planets to strip for parts.
Also in Co-op · Replayable, Relaxing
80% of 2,447 Steam reviews are positivePlayers online now: 106$19.99Sigma World Online
An online sandbox across generated star systems: mine, farm, cook, research, build, and eventually fly between planets. Slow-paced and old-school, with more systems than most games bother to explain. If you like settling in for the long haul, this one rewards patience.
Also in Co-op · Replayable, Relaxing
68% of 47 Steam reviews are positivePlayers online now: 10$9.99Adaptory
Deep in uncharted space, your expedition took a challenging turn when your ship crash-landed. Master complex simulations to keep your outspoken explorers alive, face unpredictable challenges, and figure out a way back home.
Replayable
76% of 99 Steam reviews are positive$19.99Startopia
A once thriving network of space stations and planets have been left lifeless, redundant scars of the apocalypse. Into this age of darkness comes light. You will lead the way in rebuilding the network of space stations to a standard accepted by the individual alien races, attracting them to harness their expertise and research new...
Replayable, Retro, Relaxing
91% of 845 Steam reviews are positivePlayers online now: 5$6.99Farworld Pioneers
Explore an open world, sci-fi sandbox – in PVP, PVE, and co-op. Build and manage colonies on alien planets, and recruit AI survivors with unique personalities and skills. Craft, build, mine, farm, or get your electric death rifle and say hello to your neighbors.
Also in Co-op · Replayable, Retro
37% of 623 Steam reviews are positive$3.74The Crust
Build a lunar colony Earth depends on. Mine regolith, run conveyor-and-drone factories above and below the surface, keep your colonists fed and sane, and trade with rival factions whose politics you can bend. A story campaign with multiple endings, or sandbox at your own pace.
Replayable, Relaxing
75% of 3,986 Steam reviews are positivePlayers online now: 538$19.19Sapiens
Sapiens is a prehistoric colony sim where you start with nothing and guide a small tribe across thousands of years of discoveries, on a procedurally generated planet bigger than Earth. Build towns piece by piece, research by poking the world itself, and play alone or build sprawling cities with friends.
Also in Co-op · Replayable, Relaxing
79% of 2,080 Steam reviews are positivePlayers online now: 20$24.99Beyond These Stars
Build a city on the back of Kewa, a lonely Space Whale drifting between stars. Lay out streets, dig canals, plant forests and keep your Peeps fed while learning to coexist with the living world under your feet. A gentle, thoughtful colony builder about balance rather than endless growth.
Replayable, Relaxing
65% of 263 Steam reviews are positivePlayers online now: 75$29.99
Cheaper than 绛河之上 Under Supernova
Farworld Pioneers
Explore an open world, sci-fi sandbox – in PVP, PVE, and co-op.
37% of 623 Steam reviews are positive$3.74
The Last World
The Last World is a sci-fi simulation game with elements of space, adventure, survival, modding and automation.
68% of 28 Steam reviews are positivePlayers online now: 1$4.99
Earth Simulator
Shape continents and climates, then watch civilizations rise under your hand, with friends along for the ride.
93% of 240 Steam reviews are positivePlayers online now: 89$4.99
My Colony
Build a space colony from a single rover, grow it into a sprawling economy, and rule it your way.
88% of 277 Steam reviews are positivePlayers online now: 10$4.99
Unclaimed World
Manage interstellar pioneers and their descendants in this detailed sci-fi colony sim.
49% of 179 Steam reviews are positive$1.18
Heliopedia
A fictional universe sandbox/exploration game. 🪐☄️✨ Shape your own solar system by terraforming planets.
87% of 202 Steam reviews are positive$4.99
Unknown Planet
Your spacecraft has crash landed on an alien planet. Explore this unknown world, mine the resources, build your base, grow farms, craft equipment…
97% of 32 Steam reviews are positive$3.99
Craft Hero
Gather resources by day, build and recruit by noon, defend your village by night!
81% of 370 Steam reviews are positivePlayers online now: 2$4.99
Outpost Zero
Outpost Zero blends the genres of Multiplayer Base Building Survival and Simulation games in a Sci-Fi universe.
51% of 580 Steam reviews are positive$3.99
Green Project
Wake from cryosleep to a fungus-choked Earth, then farm, craft and plant trees at your own pace until the world around you visibly turns green again.
80% of 1,434 Steam reviews are positivePlayers online now: 13$5.99
Space Architect
Mine asteroids, build production lines, keep your crew fed and trade with passing ships to buy back your freedom.
72% of 307 Steam reviews are positivePlayers online now: 24$1.79
Hidden gems like 绛河之上 Under Supernova
Earth Simulator
Shape continents and climates, then watch civilizations rise under your hand, with friends along for the ride.
93% of 240 Steam reviews are positivePlayers online now: 89$4.99
Planetary Life
Terraform a barren world, tune its climate and watch the life you seed evolve across millennia, all at your own unhurried pace.
94% of 949 Steam reviews are positivePlayers online now: 17$11.99
Astrobuilder
An AI-driven space management RPG in a living galaxy. Explore 150+ planets and interact with 600+ NPCs whose lives and relationships evolve over time.
88% of 354 Steam reviews are positive$14.99
Astro Colony
Set up conveyor networks, dock your stations and research new tech at your own pace, alone or with friends.
80% of 2,447 Steam reviews are positivePlayers online now: 106$19.99
Havendock
Turn a lonely raft into a cozy ocean colony, fishing debris from the waves and automating your way up to submarines and a rocket.
81% of 1,513 Steam reviews are positivePlayers online now: 16$19.99
Solargene
Run a private space corporation across a realistically simulated solar system.
77% of 786 Steam reviews are positivePlayers online now: 18$34.99
Of Life and Land
Lead villagers through wild lands where every animal and plant is fighting for its own place.
82% of 293 Steam reviews are positivePlayers online now: 12$12.49
Space Haven
Build a spaceship tile by tile, keep its air breathable and its crew fed, then jump it toward a new home.
85% of 10,448 Steam reviews are positivePlayers online now: 626$24.99
Alien Horizon (Preview Alpha)
A sci-fi survival city builder set on an inhospitable alien planet.
87% of 209 Steam reviews are positivePlayers online now: 2Free
The Crust
Build a lunar colony Earth depends on. Mine regolith, run conveyor-and-drone factories above and below the surface, keep your colonists fed and…
75% of 3,986 Steam reviews are positivePlayers online now: 538$19.19
Stardeus
As the ship's AI, keep a dying vessel running, manage fragile human survivors and steer your rebuilt colony through a hostile universe.
87% of 1,466 Steam reviews are positivePlayers online now: 198$29.99
Mercury Fallen
A sci-fi colony management sim with a focus on exploration, expansion, and survival.
78% of 259 Steam reviews are positivePlayers online now: 2$24.99
Newest games like 绛河之上 Under Supernova
Beyond These Stars
Found a settlement on a living Space Whale and journey across the galaxy together.
65% of 263 Steam reviews are positivePlayers online now: 75$29.99
The Crust
Build a lunar colony Earth depends on. Mine regolith, run conveyor-and-drone factories above and below the surface, keep your colonists fed and…
75% of 3,986 Steam reviews are positivePlayers online now: 538$19.19
Sigma World Online
Pick a role in a huge generated galaxy: explorer, miner, farmer, cook, scientist or builder, alone or with friends.
68% of 47 Steam reviews are positivePlayers online now: 10$9.99
Earth Simulator
Shape continents and climates, then watch civilizations rise under your hand, with friends along for the ride.
93% of 240 Steam reviews are positivePlayers online now: 89$4.99
Astrobuilder
An AI-driven space management RPG in a living galaxy. Explore 150+ planets and interact with 600+ NPCs whose lives and relationships evolve over time.
88% of 354 Steam reviews are positive$14.99
Starsandisland Modkit
100% of 2 Steam reviews are positive
SpaceCraft
Mine planets, assemble ships from parts and grow a trading empire with friends in an open galaxy.
63% of 2,738 Steam reviews are positivePlayers online now: 232$29.99
Astro Colony
Set up conveyor networks, dock your stations and research new tech at your own pace, alone or with friends.
80% of 2,447 Steam reviews are positivePlayers online now: 106$19.99
Space Haven
Build a spaceship tile by tile, keep its air breathable and its crew fed, then jump it toward a new home.
85% of 10,448 Steam reviews are positivePlayers online now: 626$24.99
Generation Exile
Rebuild settlements entirely within a colossal generation ship in this turn-based city builder.
65% of 49 Steam reviews are positive$29.99
ALL WILL FALL
Lead flood survivors, scavenge a drying seabed and stack a shanty town toward the sky while physics, hunger and factions test every beam.
77% of 1,317 Steam reviews are positivePlayers online now: 92$22.49
Adaptory
Deep in uncharted space, your expedition took a challenging turn when your ship crash-landed.
76% of 99 Steam reviews are positive$19.99