Oh god. I never knew catching a fish would be this awesome. You catch fish, you sell fish, you upgrade your stuff and catch better fish. Keep in mind that there's actually a limit on your fish container and the fish will literally bounce off if your container is full. It's so cute seeing you actually go fishing. If you click manually, you're pulling the strings and eventually get a fish. And if you use an autoclicker, this becomes a dopamine machine. There's also a chance you catch something special, which a cutscene will play, and then fishing becomes extra fun. You get more fish, more stars, and one heck of a dopamine rush that makes you want to fish harder and faster. Once you catch all fish, you'll visit the undersea, which is pretty much the "end".. not really, it's just a nice break and you can go back and fish as much as you want to. The undersea is AWESOME. You're admiring them, and they're just swimming around and it's so beautiful.
Everything fits together so well, it's sad that it's so short. You're missing out.