Really charming game so far, I enjoyed the music in particular. However, I came across a bug in the WebGL version that prevented me from continuing. When the very first anglerfish attacked the submarine I couldn't move anymore, and it was able to keep pummeling me right through a rocky barrier until we got stuck on a ceiling. It continued attacking me even when I paused the game, and when I did so I couldn't resume. (Also when it was idle it was swimming backwards for some reason.)
I get the impression that the WebGL version might be the buggier one, so I'll probably download the Windows version and play through it later.