I really liked the game. Although, due to the limited number of buttons on the GB it was very confusing to me to play, I'd love to play with a more "Guitar hero" approach, or at least 4 keys in order. Not the fault of the game of course, just the limitations of the jam. Good thing, failing your strokes did not punish you, so I could just mash all keys around the same time in the difficult parts.
Graphics and music are 10/10, would recommend!