Loved the idea of a rhythm piano game with construction and the style is so cute as well! But the issue I encountered was that the easy levels were way too difficult, there was no time to react to the notes. Just an idea but maybe the notes could correspond to the song's notes, for example for the 'Twinkle Twinkle Little Star' easy level it could have you play the actual corresponding piano notes of the song maybe, it would also make it easier! And then for the medium difficulty ones you could have more chords instead of single notes and so on :) but overall i loved the idea, great work!