This was good; there was a good flow of action, animation, and unlike Sonic X the cartoon, and more in line with what we know about Sonic - he has his attitude, he is cocky and he has an ego. Not to mention there is a dose of comedy involved for those of that are old school Sonic fans. Having said that, this animation could have been longer; if you would have included more skits - as in, each one was a brief skit and made up a larger series the likes Sonic Paradox makes in their Sonc Shorts collection, this would have been a fine addition. I'm sure you can make improvments in the future. Keep animating; you've already done something most sprite animators will never accomplish - something that was actually enjoyable and not lame.