All I can really say is I WANT MORE! I absolutely adored this game. Whoa, I'm just noticing that the font used in this comment box matches your game's font. That's a nice touch! I didn't even know you could do that.
Anyway, back to the game, I loved loved loved it! Playing notes and little melodies is just fun. The game provided a nice and fair challenge. I like that the levels are short enough that if one fails, it's easy enough to try again.
My only real criticism is the dialog boxes. I would have preferred being able to progress them myself by pressing one of the buttons. They went too fast for me to read and if I died, I had to rewatch all of them. That said, you made this in a single day. I'm certain if you had another day, you'd have addressed this.
Seriously, this is an absolute gem of a game. You should be very proud of what you accomplished here.
If you'd like to see a live reaction of me playing your game, visit https://www.twitch.tv/videos/2240349196?t=00h29m30s