I LOVE the voice of your game at the start menu! It gives me nostalgic feelings :D
OldSchool guitar hero vibes! I like it.
Maybe easing in the player with levels will help, as My fingers did not want to work together, So instead of having 4 keys, only go with two.
Also when in the game there is now way to get back to menu.
Good music choices though! The Art as well!
Amazing Job with completing the Game JAM!