Your game reminds me a lot of a game I made for the ludum dare 48 on the theme Deeper and deeper ;)
But yours is so much prettier and better, I love it ! <3
I really liked the moment with the big "fish" at the bottom, it's so surprising ! However, I was so happy to have escaped it but I was disappointed to see that I wouldn't get my oxygen back when I surfaced and then the sharks finished me off before I got to the boat ^^'