I really like your concept of making a cliker game. The visual style is very interesting, I like how you group realistic figures together in a non-realistic way. My game did crash after several thousands of fish and I think one way you can fix it is maybe delete some of the fish once they fly too high and become too small to see? Maybe you just need to keep the fish's amount at 100 or so to make it looks like there are a lot of fish. Overall I like this game!