Sonic x Shadow and it's very good.
I really liked the Sonic part, but the Shadow part is better. It's a bit normal since he has powers and the handling is somewhat based on Frontiers.
The only thing I didn't like was Planet Wisp because it slows you down and the Doom mutation handling, which is really bad and unintuitive.
The Time Eater boss is pretty bad too; he takes too long to beat. I preferred the Shadow ones.
As for the rest, they're on the right track. I love the game so much that I'm doing it 100%.