I'm a simple man - if you can catch fish in your game, I like your game.
The implementation of fish silhouettes in the water is super impressive from the technical stand point. I don't know exactly how you did it, but it feels like a combination of using shaders and procedural animation. Really cool that you've found time for something like that!
One thing I wish was in the game is some sort of shop to sell your fish to. I don't even want any upgrades or anything, it's just that without it the cycle of fishing minigame feels incomplete :)
Good job!