Well besides never getting anything higher than D in my play through, it was fun.
I guess I missed some element of danger, but also can appreciate a almost non violent game.
The good:
lots of levels
nice art style / art
great music choices
fun game play
simple controls
The not so great:
story pretty simple
could use more sound effects
feeling of speed is a little muted by having to regenerate energy ? I don't exactly know what it is, just I wish I felt more speed ( maybe I'm just not good at it or didn't quite understand how to maximally regenerate energy ? )
Somebody who gets a good score, do a recording so I can watch =] !
Anyway great job.