Neat concept and I love the look of the game! The oxygen sound effects were a nice touch that really helped push the atmosphere too. The movement was a bit rough as I kept getting stuck against walls while trying to jump up things which ended up with me getting stuck in the cave at one point. It also seemed like the ship would get damaged very quickly which discourages you from roaming too far. Otherwise, I think the idea is solid and with a little bit of polish it would be quite fun.