I had to replay a lot of times the tune and my versions to be able to get it right in three attempts.
One feedback is that I would like to be able to play more times a day. Unlike Wordle, your game has a few interesting variations. In particular, the instrument options. I would like to keep playing with it to explore those options. I imagine other people would like to test the hard mode as well, to see if they can get it right with the replay limitation. But after playing the first time to understand the game, you can’t explore more.
Finally, I personally would like to choose the music genre of the puzzle. I would likely choose classical music, so it would also add some discoverability aspect on a music genre that I enjoy.
Anyway, congrats on the well done game!