Klei Entertainment, already known for Don’t Starve, took a hard turn into physics-based colony management with Oxygen Not Included. Released from early access in 2019, the game asks you to keep a small colony alive inside an asteroid by managing every gas, liquid, and thermal interaction in the environment. It sounds niche. It’s actually one of the most compelling management games on PC.
Community reception is near-universally positive among players who get past the learning curve. The word that appears most frequently in discussions is “deep,” and it’s not used lightly. Oxygen Not Included simulates gas behavior, liquid physics, thermal dynamics, germs, and stress at a level of detail that creates genuine engineering problems rather than game-like approximations.
Engineering Problems That Feel Real
The physics simulation is what makes Oxygen Not Included special. Gases have different densities and rise or fall accordingly. Liquids flow based on pressure. Heat transfers between materials at different rates. These aren’t abstractions. They’re functional physics systems that interact in ways that create real engineering challenges. Your colony needs oxygen, which means you need to produce it, distribute it through your base, and manage the heat generated by the production process. That heat will affect your crops, your equipment, and your colonists’ comfort, creating a cascade of problems that each need their own solution.
This interconnectedness is the game’s defining quality. Nothing exists in isolation. Building a power generator solves your electricity problem but creates a heat problem. Solving the heat problem with cooling systems requires water, which requires pumping, which requires power. Every solution spawns new challenges, and managing these cascading dependencies is where the game’s satisfaction lives.
Colony management adds a human dimension to the engineering challenges. Each duplicant (colonist) has stats, skills, traits, and stress responses. Some are better at research, others at construction or ranching. Managing their work schedules, living conditions, and morale is necessary alongside the physical infrastructure. The duplicants aren’t just labor units. They’re variables with needs that complicate your engineering designs.
The Spaced Out DLC expanded the game to include multiple asteroid colonies connected by rocket travel, adding logistics management to an already complex game. Managing supply chains across different asteroids with different resources creates an entirely new layer of challenge for players who’ve mastered the base game.
The Vertical Wall of Entry
The learning curve is genuinely daunting. Oxygen Not Included teaches through failure, and early colonies will fail spectacularly as players learn about gas management, temperature control, and the dozen other systems that need attention. The game’s tutorials cover basics but don’t prepare you for the complexity of mid and late-game challenges. Community resources, wikis, and guides are practically essential for new players.
The visual style, Klei’s signature cartoon aesthetic, belies the game’s complexity. New players looking at screenshots might expect something casual or lighthearted. The cute duplicants and colorful art create a misleading impression that the first few hours quickly correct. This visual-gameplay mismatch isn’t necessarily a flaw, but it sets inaccurate expectations.
Late-game colonies become computationally demanding. As your base grows and the simulation tracks more elements, frame rates decline. Very large or complex bases can become sluggish, and the optimization required to run smoothly at scale is a metagame in itself. This performance ceiling limits how far you can push your ambitions.
Information presentation could be better. The game provides overlay views for gases, temperatures, and other systems, but parsing the information, especially when multiple problems overlap, requires experience. Understanding why your colony is failing often means cycling through several overlay modes and cross-referencing data that the game doesn’t make easy to compare.
The Problem-Solving Addiction
Oxygen Not Included creates a specific type of engagement that’s closest to actual engineering work. When you figure out an elegant solution to a complex problem, like a self-sustaining cooling loop that handles waste heat from three different sources, the satisfaction isn’t just gaming satisfaction. It’s the satisfaction of solving a real puzzle with real constraints. Players describe “eureka moments” that rival anything in the puzzle genre, and those moments drive hundreds of hours of play.
The depth of the simulation means there’s always something to learn, always a more efficient design, always a new challenge to tackle. Mastery of Oxygen Not Included is a journey measured in hundreds of hours, and the game rewards every one of them.
Should You Play Oxygen Not Included?
If you enjoy complex systems, engineering challenges, or colony management, this belongs at the top of your list. It’s ideal for players who find satisfaction in optimizing interconnected systems and who don’t mind learning through failure. A tolerance for complexity and a willingness to consult community resources will serve you well.
Skip it if steep learning curves frustrate rather than motivate you, or if the idea of managing gas physics and thermal dynamics sounds tedious rather than exciting. This is not a casual experience and doesn’t pretend to be.
The Verdict on Oxygen Not Included
Oxygen Not Included is a masterclass in simulation design that asks more of its players than almost any game in the genre and rewards them proportionally. The physics simulation creates problems that feel genuine rather than gamified, and solving them delivers satisfaction that’s rare in gaming. The learning curve is enormous and the late-game performance can struggle, but for players who want depth above all else, Klei Entertainment built something extraordinary. This is a game that trusts its audience to be smart, and that trust is rewarded with one of the richest management experiences on PC.