The levels seem like they were designed to be too long for a game with an insta-kill mechanic and no mid-level checkpoints. There's also no real indication of danger before you smack face-first into it, and this holds true for the green light eel creature, since it's impossible to know which side it's pointing towards. I'd suggest adding positional audio for all other fish and changing the light for the eel to a cone shape for people to infer what direction it's facing to make it fairer. There's also not much in terms of player direction, which I can see why that would be justified, but it also ends up detracting from the experience, and it ends up being a bit frustrating once you start introducing stealth mechanics. Conceptually, I think it's very cute and fairly interesting, and I like the stinger that plays whenever you complete a level- it just needs some improvements to the player experience.