Thank you for your feedback!
The game's itch.io page does tell the player about the notes attached, but since some people download it from here without opening the page, I added a "Help" button in the game that tells the player about the notes. (also as I said before the notes are out side of the game exe as a challenge from the first jam)
I do want to add background music but I'm can't make music (try my other games if you want to see me attempt to, and fail horribly) and I don't have any friends that do, so I left it empty.
P.S: I feel it is complete. I might come back to fix bugs or add music if I meet someone, but other than that I don't think I will continue working on the game.