These puzzles are quite clever and innovative! However, I think they might need more feedback, in order to teach players. Even once I figured out the rules of each one, they were still hard and confusing. The first two relied more on memory than listening, as the melodies could be quite long and it isn't clear what separates each "segment". There is also a lot of instruments, which makes focusing a bit difficult. As for the third one, even with the music theory knowledge, recognizing chords just by hear was too difficult for me (I would at least need a tonic as reference).
But the idea remains pretty interesting. And visually and musically, the game is really well executed! It shouldn't need a lot of improvement to guide the player a bit, and allowing them to understand the puzzles even without having an exhaustive musical knowledge.