The fonts are pretty hard to read, the notes are not always fitting the music and the flute sounds like a clarinet. Also, it might be because I'm used to osu!mania, but seeing the notes scrolling horizontally feels weird.
However, I love that within a few lines you manage to give each of your characters strong personalities (even if they're a bit cliché), fun puns and a role in the song. The twist with the Devil playing triangle was great as well! This game tells a little story with nice characters with music being the main subject (even if the guy's reasons for being in hell in the first are kinda blurry).
I loved playing this game, well done ^^