Dont Breathe
This game is from the old Ludum Dare platform. You can try viewing the original page on Web Archive
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A very very unfinished demo. Your are in a tiny closed ecosystem. If your oxygen drops too low, then you risk the bends. If you oxygen raises too high, you risk altitude sickness. Plant plants with "p" button. But you'll need to balance your needs of oxygen and food for your plants need of co2 and nitrogen.