Oxygen Not Included CD Key

Users wrote

Many reviewers say Oxygen Not Included is a deep, challenging colony sim. It has a very complex thermodynamics and base-building system. It is addictive and replayable with many ways to play. The visuals are charming and guides and DLCs help players learn and expand the game.

Last updated: 2026-03-01

Most Mentioned Advantages

• Charming visuals and sound (30 mentions) - The art style is cute and distinctive. Visuals and sound effects contribute to a pleasant atmosphere. The style helps balance the heavy mechanics. Many players enjoy watching the base grow.
• Deep, complex thermodynamics and engineering (26 mentions) - The game simulates gases, liquids, heat, and power in a detailed way. Players design and run automated systems to keep their colony alive. Reviewers praise the depth and the challenge of managing these systems. The complexity makes the game very rewarding when things work.
• Challenging and rewarding gameplay (20 mentions) - The game is very challenging at first. The challenge can be intimidating but solving its systems is very rewarding. The learning curve pushes players to master automation and design. Many players keep returning to improve their colonies.
• High replayability and map variety (18 mentions) - The maps are randomly generated and offer many playstyles. Each run presents new challenges. The depth of systems allows many different optimization routes. This creates long-term engagement.
• Community resources and DLC expansions (14 mentions) - A large community provides guides and a wiki to help learning. Guides help with planning and troubleshooting. DLCs add more content and features. Reviewers see these resources as essential and helpful.

Most Mentioned Disadvantages

• Steep learning curve for beginners (22 mentions) - Many players find the game hard to learn. The in-game help is limited and players often need guides. New players can feel overwhelmed by terminology and complexity. The difficulty is a barrier for some, even though it is part of the appeal for others.
• Limited in-game tutorials; rely on external guides (17 mentions) - The game lacks a comprehensive in-game tutorial. Players often need to consult wikis or videos to learn. Early progress can be slow due to missing explanations. Guides are helpful but required for many players.
• AI and dup behavior can be frustrating (13 mentions) - Duplicants can misbehave: ignore priorities or get stuck. Pathfinding can fail and slow progress. These AI quirks add challenge but can be annoying. They are a known source of frustration for some players.
• Performance issues on larger bases (9 mentions) - Some players report lag as bases grow. The simulation can be CPU intensive and late game bases can run slowly. This can slow progress and reduce the experience for some players.
• Stability issues and crashes (6 mentions) - There are reports of crashes and instability, including unexplained crashes. Late-game performance or updates can cause problems. This may deter some players from sticking with the game.

Compared Games

• RimWorld (3 mentions) - Some reviewers compare it to RimWorld due to similar base-building and management concepts, though Oxygen Not Included uses a side-scrolling view.
• Don't Starve (2 mentions) - Several reviews reference Don't Starve as a point of comparison for difficulty and survival challenge.
• Dwarf Fortress (2 mentions) - Some reviewers compare it to Dwarf Fortress in depth and complexity.