I played the initial jam version even though there is a newer version yet, so some issue i encountered are propably already fixed. 

1) I really liked the music, but suddenly out of nowhere it stopped

2) the ocean is really really sparse, it contains a few rocks, but i would like to see some caves, larger dunes and much more

3) the shop is just a weird table-like thing

4) text at the start glows a lot which is easy for orientation, in my opinion the orientation should be harder so you really think about going farther away from the safe spot 

5) rocks have weird icons, i understand that you propably ran out of time before managing to draw some, but atleast so that different rocks would have different colors of the arrow icon

Overally i really liked this concept of the game, the only thing i dislike is that you don't really dive deep that much and that the animations are kinda weird. I really enjoyed this entry though, i want to see some updates on it. 

sensitivity too high but overall, cool concept!

Cool that this is 3d diving game. Nice design of character. Controller seems to be little bit chaotic (keyboard+mouse).