Finally reached the bottom on day 15. I do like how you need to balance your oxygen and how far you go down, although this can be countered by really counting out loud how many steps you need to go back, greed always gets in the way. The graphics are decent, though I think the shop needs a bit more work as it's busy and messy in its current state. The game would also benefit from some background music too.
Anyway, I think this is quite a solid entry. Keep up the good work!