This is a stupid question but, is there any oxigen in the Medium? In the Incipiscere? In the dream moons? In the meteor? On the planets without plants? And if it is, where does it come from?

Just like how there’s electricity and Internet even though the houses have been severed off the grid completely, it’s likely that there’s either just random oxygen everywhere, or that everything past the game is more conceptual than physical, so it’s more that they stop physically requiring oxygen to survive?