Very interesting take, i managed to do it on the second run, the water getting lighter closer to surface was a nice addition. I liked a lot the claustrophobic effect at the early stage of game, the audio being sparse intensified it. Very impressive that you managed to implement all the achievements for the jam.
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Thank you very much! I initially started with a depth indicator, thinking of maybe an arrow. But they felt too handhold-y. So in the end I decided just to add light near the surface. Claustrophobia was very much the original idea, especially if/when you run out of battery lol. Achievements were a last-day deal because I was worried about replayability/keeping player interest.
Thanks for playing!