Thank you so much! I really appreciate it and I'm super glad I ended up finishing this game now. I would really love to make this into a full game, but it's hard to think of ways to give reason for this game to be a platformer. Right now you travel to a crystal, listen to it, and go right back, and there's nothing to stop, or make it more difficult other than travelling. If you have any suggestions on how to actually do this I would be glad to hear them!
Also I really want to add rhythms and chords, but I would most definitely have to come up with an interface that makes it more clear. Also I wanted to do the C Major scale with every note, but just limited it from C to G to make it easier to get through. The full game would probably add extra notes, change keys, or add harmonies over the course of many levels.
I really like the idea of making this into a full game and spending a couple months making it into a cheap experience for others to play. I'm hoping that I can come up with some other features, but I'm unsure as of now. I might also throw in enemies to make it a rhythm hack n slash, but I'm unsure as of now. Overall, I really appreciate your feedback, and I'm glad you though so highly of this game! It took some work.