This is a really great game! Love the concept, love the art, and weirdly enough, I got real chills at the ending!
Maybe there could be more deliberate switching of the fish from the player? What I mean is that currently, when I get eaten it's intended. But what if it's more of a puzzle game, where I need to deliberately decide by whom I want to get eaten to then unlock the fish's ability. Speaking of the abilities: I'd love to see more of them! I think it's safe to say that it would be really interesting to see the abilities of more fish and where you take this concept in the future, if you decide to continue working the game. Great job!