lets say a player jumps into space and they can only stay out before they have to come in for a new air tank or somthin
So there would be a bar to indicate air amount, and players would have an "Air Tank" item to replenish air? There could also be a "Jet Pack" item for space flying, and it could have a "fuel tank" item to replenish it's fuel, also indicated by a bar. If there is a "Flying cap" that lets you fly, can there be a Jet Pack?