Good idea, but...

it's not executed all that well. The instructions weren't very clear, so I kept dying time after time. The gameplay was very confusing. It seemed like you tried to have too much going on at the same time. Focus on the notes more, and also allow more time to see which keys will need to be pressed. The graphics didn't do much for me, but I really enjoyed the music. Just refine and focus the purpose of the game, and spend a little more time on the graphics, and this will be a fun one.