Fun game! Reminded me a lot of Feeding Frenzy which I can see you mentioned in another comment. One thing I didn't love is the way that combos work - the number counts down, but to extend your combo you actually need to count up since each new fish adds to the start of your countdown. The effect is that once you have a small combo it's much more safe to sit around and not eat any fish until your countdown is passed, since you have very limited time to grab a new higher number and you can't extend a combo once it starts. It's a small thing but I think if new bites added to the end of your combo it would increase the game pace and make it less staccato.