Yeah, I'm with the consensus here: Now that you have the game mechanics down, you need to work on coordinating the arrows to match the beats in the music.
Most games allow for the character to hang partly off the platforms without killing them. This game kills you if you're even partly off the platform. =\
It's okay, but rather frustrating and unnecessarily long. 4/5
It's cute. =D Along with what others have said, you might consider making the next one more open-ended, perhaps with the chance of dying here and there.
How many times are you going to milk this "let's take something simple and turn it into a full-length 'game'!" concept already? This is getting old, fast. Also, how shameless is "Time to Refresh". Really.