Very original idea. Haven't really seen a game quite like this. However there are some things that i think could be improved, make the full screen expand the game view, add a replay button for the sound and maybe some ui elements to better explain the melodies.
Viewing post in Sound is key jam comments
Thank you for playing my game. I have addressed the elements that were difficult to understand as quickly as possible. I am currently considering how to implement a method to visually represent the melody, but it seems like it will take some time to implement. Thank you very much for your valuable advice!