Hey pretty solid game for a solo dev! I did run into a repeatable bug area that stopped me from progressing, but played it again and got past it. I liked shooting the fish, the gun was a lot of fun! Aside from the bug I think my only criticism is that it takes a little too long to get into the meat of the game, and I think finding keys and shooting fish is more engaging gameplay than having to get your gear and get to the dive spot. I really liked that the audio and visuals changed as you got to deeper areas, great design choice.
Unfortunately I didn't have time to complete it but if you want some more in-depth feedback you can check out my gameplay video playthrough here: