Not that I want to undermine the hard work that has gone in to this, but am I the only one who thinks Sonic is overrated? The slow bits when you're just walking around are boring, and the fast bits where you're zooming along the loops and the tubes are frustrating. Especially in the later Sonic games there seemed to be extended periods where the game seemed to play itself as Sonic zoomed along, only to land perilously close to some spikes.
I'd rather play Zool TBH.