Oxygen Not Included is a space-colony simulation game where players are tasked with managing a group of colonists trying to survive in an underground asteroid base. The game challenges you to maintain a stable environment by managing resources like oxygen, food, and water, while also dealing with the psychological and physical needs of your colonists. You'll need to build and optimize your base, explore new areas, and research technologies to ensure the survival and well-being of your colony. The game combines elements of strategy, resource management, and simulation, offering a complex and engaging experience.