Pretty cool! I remember they were doing an HD ROM hack at Sonic Retro but unfortunately stopped it. Anyway, I know this is an alpha but there are a few things I'm noticing that seem off:
-The game is laggy every now and then. This might just be the video, but I didn't try the game out yet
-The music restarts with a sped-up version when you hit a Speed Shoes monitor. The original game continued the music and made it faster
-It looks as if there's a speed cap on rolling. The original game didn't have one
-Acceleration seems to act strange when you go up hills
Regardless, this looks pretty good and I look forward to the final release!
It was actually the video that made it seem laggy. I agree with the speed shoes though. Another thing I also agree on is rolling but I am not sure on the acceleration on going up hills. I really hope they fix the speed shoes making the music go faster though.