This was fun and creative! The main rhythm mechanic is something I haven’t seen before. Your art is nice and I liked all the different fish. If you want to expand on this, I bet you could make it into a full blown typing game! Then you would have the full keyboard to work with and could add even more fish. If I was a kid learning to type for the first time, I’d love a game like that.
Your tutorial screen is hilarious btw. Good work!