Sixty-four Pixel Colonists

Hmm simple question but is oxygen a potential factor in this ? (There's been no mention of it as far as i can read unless I missed it, but it'd make sense what with being on a small asteroid in the middle of deep space...)

Because if it is, that give that much more importance to algae tanks, assumig they're photsynthetic algae, they can recycle air

For that matter, speaking of alga tanks, that reminds me.. what about water as well ? At least the drinkable stuff. Because it feel that too is an important resource that is soon going to be at a premium.