Beautiful project, the water and artwork is amazing! Pretty relaxing, although I couldn't really figure out where to go, and I found some info and got a 'ding' sound but that didn't save anything. I eventually saw Jern play it and how that works, seems random to find? Wish there was a way to search that didn't feel random, I think maybe the sonar could have gone a lot further? Other than that, the controls and camera felt a bit awkward, not sure why, I think maybe I expect it to feel like a flight sim where you're swimming by default? Might be good to try "press to stop" (i.e. swim forward by default) rather than "press to swim" (stopped by default)..
Anyway, great job and congrats!
PS: I'm a big fan of the sonar mechanic, I based my previous game jam project on that!