Meh
Controls: frustrating as hell. Seriously, the piranhas keep jumping all over the place, tracking isn't very good, my fish kept teleporting to random corners quite a few times.
Boundaries: some of the guys/objects kept floating behind rocks, in which case I obviously couldn't reach them anymore. Annoying bug, tbh.
I did like the design though, the menus were smooth and dynamic. I also liked the upgrade system, however, didn't get to play too long since I got really annoyed with the controls. Overall, it's an okay game but I found some aspects of it rather frustrating. Got a thing for nice looking designs though, hence 6 from me!