Hey, I think the premise is cool, but in the end is just a luck based game (where you can't lose). I would suggest making the feed action faster and maybe adding some clue about the wrong or right food, maybe each fish changes color depending on what food they like and don't, and then you would have to calculate what food to give them all, taking in account some will die, some will reproduce and some will stay the same, if you get to a point with more than 10 fishes you would have to feed some food that kills more fishes that get reproduced, until you get 10 exactly. But I understand then it would be a different game, so it's just a suggestion. Good luck