I'm Impressed
I was quite impressed by the graphics done in this. Nice look to them with the color and all, and I love how you made the entrance of each character different. It made it more interesting.
Brilliantly done. It's really something.
To help you though, I will add things I think cound have been improved. Firstly, the main song was "This Machine" and I found it inappropriate to the setting. Something like "Open Your Heart" would have fit a little more well concidering this is about Sonic, not all Shadow and such ^_~;; Also, I find Sonic's leg movements should have been a bit more rapid/blurred.
Other than that you did a totally fantastic job and I gave you the '5' rating for sure =D I'm impressed. Faving this one too.