I'm looking forward to seeing how this'll develop! The idea makes me think of the Angel's Egg movie, but the surroundings are much brighter. I'm not sure if you're attempting to make the world seem a bit menacing (the fish do seem menacing), because if you are the colors and ambient music don't really enforce that impression. The character expressions, however, speak more than the surroundings. I'll stay tuned for the sequel!
-cd-