well, heres the deal... he runs at this miles per hour, kilometers per hour, and he laid out all of the statistics on how fast this hedgehog goes, and he was like In order to make a game where Sonic is running and everybody enjoys the whole thing we'd have to design this many miles of level, and it was some ungodly number.
Oh and one last thing, the music in this game is absolutely fantastic!
i wish this would get released already!
wish they'd just remake Sonic2 side scrolling but 3D if that makes sense
Boss battles are ace, and I even enjoy the warehog parts too. Only played a little bit so far, first "jigsaw piece". So off to play some more 
