Best Space Colony Sim Games: Life Support as a Design Tool

The best space colony sim games are Space Haven, which left early access in May 2026 and combines ship building with RimWorld-style crew simulation, and Stardeus, which casts you as an immortal AI running a wrecked ship. Oxygen Not Included and Surviving Mars round out the subgenre from the engineering and city-building sides.

Space colony sims are the same genre as their ground-based cousins with one rule changed: air costs money. That single change does more design work than it sounds like it should. On a planet, a wall is a wall. In a vacuum, a wall is the only thing between your colonists and a very short future, which means every layout decision you make is also a risk assessment.

The result is a subgenre where the building matters more. Ground-based colony sims are mostly about people and logistics, with terrain as a backdrop. Space sims make the structure itself into a system: rooms hold atmosphere, atmosphere leaks, heat has nowhere to go, and a stray asteroid can turn your carefully optimized kitchen into an airlock.

What is the best space colony sim game?

Space Haven is the best all-round pick. It reached 1.0 in May 2026 after roughly a decade of development, and it refuses to choose between ship building and character simulation, giving you hull integrity, oxygen, and temperature alongside a crew with needs, skills, and moods.

Space Haven is the one to start with. It is built by Bugbyte, a small Finnish studio, and after roughly a decade of development and six years in early access it hit 1.0 in May 2026. Coverage at launch put it above 700,000 sales with a Very Positive Steam rating, which for a three-person team is a genuinely absurd outcome.

What it does well is refuse to pick between the two halves of the genre. You build a ship tile by tile, managing hull integrity, oxygen, temperature, and power, and you also manage a crew of individuals with needs, skills, moods, and relationships in the RimWorld tradition. Its stated influences are RimWorld, Oxygen Not Included, and Spacebase DF-9 on the mechanical side, and Battlestar Galactica, Babylon 5, and Firefly on the tonal side, which is about as honest a description of the finished game as you could write.

The 1.0 release also turned on Steam Workshop support, so the long tail of the genre, mods, is now available to it.

What is Stardeus and how does it differ from Space Haven?

Stardeus casts you as an immortal AI commanding robots aboard a wrecked ship, leaning harder into automation and systems than into people. It simulates oxygen and heat across thousands of tiles and runs power as both an electricity grid and a digital control link.

Stardeus describes itself as a sci-fi colony management simulator with aspects of automation, base building, and space exploration, and its framing is the interesting part: you are an immortal AI commanding robots and drones aboard a wrecked ship. Not a governor, not a captain. The intelligence running the place.

Mechanically it leans harder into systems than into people. It simulates oxygen and heat across thousands of tiles, runs power as both an electricity grid and a digital control link, and handles production through processors and crafters rather than conveyor belts. But it keeps the character layer too: it uses what its developer calls needs-based AI, where each agent has free will to pick its next action based on its needs, plus traits, moods, and mental breakdowns.

It is still in development, and available on itch.io, Steam, and GOG.

Does Oxygen Not Included count as a space colony sim?

It is the borderline case, set inside an asteroid rather than aboard a ship, and it belongs here because it expresses the subgenre's core idea most purely. Air is inventory, heat has nowhere to go, and every machine creates the next problem.

Oxygen Not Included is set inside an asteroid rather than on a ship, which makes it the borderline case, and it belongs here anyway because it is the purest expression of the subgenre's core idea. Air is inventory. Heat has nowhere to go. Every machine you build to solve a problem produces a new byproduct that becomes next hour's problem.

If your favorite part of these games is the part where you draw a diagram on paper before building anything, this is the best game on this list.

Which space colony sim is best for beginners?

Surviving Mars, because it is the most structured. It gives you clear objectives, a research tree, and visible progression instead of an open sandbox, and it tracks colonists as a population with needs rather than as individual characters you have to manage personally.

Surviving Mars is the most conventional entry here, closer to a city builder with a survival layer than a true individual-level sim. That is a feature if the open-ended ones have burned you: it gives you clear objectives, a research tree, and visible progression, so you always know what you are working toward. Colonists are tracked with needs and specializations, but as a population rather than as characters.

Why does putting a colony sim in space make it better?

Atmosphere becomes a resource. On a planet air is free and a hole in the wall is a draft, while in a vacuum air is inventory and a hull breach is an emergency. Every layout decision doubles as a risk assessment.

Strip out the sci-fi and what these games share is a design bet: that a simulation of individuals under resource pressure will generate better stories than a script would. Stardeus and Space Haven both make that bet at the level of the individual agent, which is the same reason RimWorld works and the same reason we ended up building one.

Pappus is our take, and the twist is the crew: it is a space colony sim about cats, and you are the AI assigned to keep them alive. Every cat scores its available actions against its current needs and personality, so what you get is not a scripted narrative but a chronicle of what the colony did, written day by day. The page has a playable demo running right in the browser, which is the fastest way to feel what the systems do.

Where to go next

If you want the ground-based canon first, that is best colony sim games. If the depth here looks like a second job, colony sims for beginners is the gentler on-ramp. For the design question underneath all of it, see games with emergent storytelling, and for the feline branch specifically, best cat games.

Start with Space Haven. It is finished, it is deep, and it is the clearest demonstration of why putting a colony sim in a vacuum was a good idea.