I already knew this wasn't going to be good but this game just made me sad. Despite the name it doesn't feel like a follow up to Sonic 3&K, and instead more of a retread of Sonic 1 but somehow worse. The special stages were just annoying, who thought adding a timer and more bumpers that knock you out of the stage to the Sonic 1 special stages was a good idea? The world map was neat but because you can just select whichever zone in any order and there's no zone transitions, there doesn't feel like there's a natural progression between areas.
To end on something positive, I did like the card surfing and the fact you can choose the specific act you want to play (instead of having to replay the whole zone, or get that option in debug mode).