Wonderous
If you went the wrong way in a level, there was always another way. I also like the way you took time to make all of the characters, so as not to make Shadow look like Sonic and make his spikes curve up instead of leaving them like Sonic's(unlike SOME people).
The unlock code was very helpful, and the victory of all of the characters made you victorious inside. The game made you think, and there was never a zone where you could just run around killing Badniks. There was always Dr. Ivo Robotnik waiting for a duel.
Your platformer was amazing, better than most artists could do. It was also very realistic to real life. If a person kept walking for a while, you would soon get tired and want to sit down. Although the characters didn't do that, Tails and Cream soon got tired of flying. If you got hit by a Badnik, you'd fall and lose some of your rings.
All in all, this was an awesome game that you had to have taken time on, where there was a beginning and a victorious end. Great job.