I tended to get eaten by fish that weren't close to me, everything moved fast and once you got really big the other big fish were unavoidable and ate you no matter where you were. Several glitches, like when you go the to top and bottom of screen.
fallenibis brings up my point... it never goes anywhere. Maybe having levels, bowser attacking you, etc, would make this game better. Right now, 3/5 for great start.
My first time playing I rated it a two, got the easy badge and never looked back.
But then, I was bored and decided to give it another try. And I realized that this game is fantastic.