What can I say...
congrats for one, on your first (incomplete) game submission. Since it is just a demo all i can really talk about is did it more or less feel like a sonic game. and the answer to that is DUH! Of course you it does, you got the original feel down pack as already stated countless times minor glitches could've been fixed and enemies would've been nice before you abandoned the project but oh well. Just tell everyone to suck it up and dust off your Genesis, and Gamecubes.
Pros:
its Sonic
nostalgia factor
good resemblance of green hill zone
cons:
unfinished game
unfinished programming
no enemies
Good first attempt 3/5 (really its more like a 2.5) But since thats a different scoring system I just rounded the number on top of that I wanted to give you a break for your first try)