It's an interesting idea, but way too difficult for me. I think some kind of tutorial would be helpful. :)

Interesting concept. I like the idea of the interaction between the character and the enemies. However, i felt unclear the exact timing for eating the opponents when they shrank. Perhaps a little visual cue could have helped, because it led me to behave cautiously in the final part where it was full of fishies. Anyway, it was fun trying to reach the end!

cool style!