Meh - acceptable
I've seen a lot worse when it comes to Sonic Flashes. My main complaints are; the layers and placement (some of it just look off) and the complete contrast of styles. Alvin can get away with it because he made custom sprites to somehow link all the style together, this is lacking in this flash.
Don't take it the wrong way, I do think you have potential. It'll be nice to see you grow and develop.