It's all right.
I think if you add more interactive elements it would be pretty cool. For instance, maybe you could have an animated Sonic run around the scene after you finish making it (perhaps allow the player to control him), and perhaps add some rings for him to collect, etc. That would take a lot of programming though. Still, it would be pretty cool! Anyway, I saw a Super Mario World version of this awhile back and it wasn't half bad, this one isn't either. Add some more interactive elements and I think it'll have more replay value.
Ps: NEVER USE RED AGAINST BLUE AGAIN! Very hard on the yes.