Tried to play with keyboard + mouse at first and really disliked it, then I gave it a second chance with the gamepad and I'm really really enjoying it?!? Controls are a bit too sensitive and dept perception for boxes/enemies can be a bit weird, but damn, what a fun little game!
Also I was never a fan of the 3D "translation" from the original series to Adventure, and I think I may like the way thisgame adapted Sonic to 3D a bit more? There is lots of exploration in each level.