Such a satisfying game loop! This is one of my favorites, I'm saving it to go back later and catch the rest of the fish. One feedback would be that once you see a fish it would show a bit about it in the encyclopedia so that way you know what upgrade to get. Took me just a bit to figure out the jellyfish was losing me fish.
But so chill and fun to play. Apparently, I need more cookie upgrades to compensate for my lack of skill