How to refill oxygen in Icarus

 

The main source on the planet is oxytes. These are stones with a blue coating that look exactly like regular gray stones. You can find small oxyte and then pick it up with your hands. Or you can stumble upon oxyite cobblestones, which need to be broken with a pickaxe.

Then open your inventory and move the oxite to any quick slot. After that, click on the desired key responsible for this access cell to instantly apply the oxyto to yourself.

The second option is to create a device called "Oxidizer".

To do this, you have to invest heavily in the technology branch. After creating the device, install it in any shelter or cave, and then fill it with oxite. It will start generating oxygen automatically.