You seem to have misdone the blue shape in the logo.
Look at the bottom of Sonic's blue side.
http://www.projectchaos.info/wallpapers/soon/soon-1600.png
http://www.zonesega.com/covers/megadrive/Sonic%20&%20Knuckles%20%5BUSA%5D.jpg
Site doesn't work again. AH well.
I should've commented on this a long time before. But I'd like to say that this is my absolute favorite remix project. Enjoying every track anytime.