Oxygen Not Included is a space-colony simulation game. Manage your colonists and help them dig, build and maintain a subterranean asteroid base. You’ll need water, warmth, food, and oxygen to keep them alive, and even more than that to keep them happy.
The game includes things like each of your colonists burning calories at a particular rate, determined by their current activity, personal metabolism, and replenished by the varied kinds of food you can make available to them. Everything has a scientific basis at its heart, even if there’s fictional elements like rocks that release oxygen underground.
Every action you take will have consequences that will ripple throughout the game world and often produces funny and frantic anecdotes. Can you make the hard decisions and make your colony prosper?
Always keep yourself breathing. The atmosphere changes over time and your oxygen levels could collapse.
Build bases and explore your new territory. Expand your space colony and do whatever you need to do to survive.
Keep your colony occupied and psychologically together. Your goal is to keep them happy with fun activities. If you don't it could be the end of your existence.