Oxygen

Oxygen is a survival city-builder set in a post-apocalyptic future. Build your city around the Oxygen Center and protect your people from crack explosions, deadly winds, droughts, and frost. Lead your population and, most importantly, keep the Oxygen Center running.

A natural disaster brought humanity to the verge of extinction. Only a few people survived because of Large Igneous Provinces: enormous volcanic fissures where the Earth's crust splits open, allowing lava to bubble to the surface and spread across the landscape while releasing vast amounts of toxic gas. The most dangerous aspect of an igneous province is that it can continue releasing lava and gases for centuries. Carried by the wind, these gases spread around the world and changed the composition of the atmosphere. One toxic magmatic gas reduced the oxygen level in the air, leaving very little oxygen on Earth. Before humanity disappears, the Oxygen Center is invented. It produces oxygen by electrolyzing underground water, using electricity generated from coal. However, humanity must gradually move away from coal and adopt sustainable energy sources. This is our only hope...