I have a lot I could say about this game. So... I guess I'll just try and keep this review short. The story, the characterization, just the writing in general is actually insane. I know it's probably oversaid by now, but it's true. The music? Also really good. The parts of the game that lack are the length, I can beat this in like 45 minutes, and the gameplay. I still do like the gameplay though, at least it isn't Secret Rings, but it still is just kind of okay. And then the voice acting was so good.
All that being said, I do love this game for what it is. If you're into Sonic, I highly recommend it even if for the story alone.