Nice little game. I like the mechanic of the cycle and the different speeds it goes at. However I think the purple and gold fishes should generally be further back, because fishes at the front are very easy to catch.
Also it would be good if you could drop a fish, because there were times I caught a fish at the back but wanted to drop it to get the gold ones that were closer to me.
Overall great job, mechanics worked well, nice graphics and music,