That was awesome! Really great job on all the scripted events and cutscenes. The whale is nicely timed and cool. The electric eel effect is very cool and also well telegraphed. The bubble pushback felt good. The octopus looks great and is a nice mechanic. The big squid is a jerk and I hate them (but also well done). And the final boss fight was exciting! I'm glad he got what was coming to him.
I did think that the 'Eat' button was kind of hard to use, because you usually were moving to the right, so it was hard to move to the right and also eat because those are usually the same finger. I also found it hard to know what my health was at. I think it was the color of my outline, but I couldn't really tell if it ever reset during a level, or how many more hits I could take, until I was already dead.
Great job with this!