Ooooooh myyyyyy god I really liked it :) I jump right into the game, needed 1 round to understand it and playing back again. The music is enjoying, the five notes series are fun to hear ! The game is so simple but so addictive that for me it's a hit. I saw you have other games based on music and rhythm, will take a look sometime ! You just gain a follower ;)
I went until "Not far from perfect" (or something like that).
PS : reading other comments, I personally have nothing to tell about the audio feedback, but perhaps we talk about visual feedbacks. I played with eyes closed...