Neat concept! I thought it was fun trying to figure out where the ship was. I wish the oxygen timer was less time based and went down as you moved around. That would give you more time to think and make it a little more strategic I think, then having it being about moving and jumping as much as you possibly can.
I think if you wanted to make it time based you certainly could, but I would have more upbeat music to really bring home the sense of urgency. Nice job overall though I thought it was a nice take on the Space theme.