I like the graphics style and the music is good too.

Finetune the motion gesture system a bit and add more backgrounds.
The accelerometer system seems a bit consistent when the game is replayed during each run. Seems to get more sensitive.
Like I said before, I like the style of graphics. You should add more images to the scrollable background.
You could use the background to display some quirks or something.

I am a fan of the gameplay.

I would have given 4 but I'm giving 5 stars for the potential the game has.