Fun, Played to finish. Could do with a bit more, or at least a longer music loop. Encountered a minor bug with buying the final hull upgrade, but it just wasn't showing up until I re-entered the shop. I'm not sure I believe that each O2 lvl gives you 30 seconds either! 3/5
 "Deep Diver"){kind=icon}
 "MegaDrill"){kind=icon}
 "Shoot! Hardcore mode."){kind=icon}