Not a bad start.
You did a fair job duplicating a Sonic game. Just gotta smooth things up, make the game screen larger while having the view actually fit. Try looking for a V-Cam for something that would help fix both problems.
Also, try to figure the script for ramps and jumps. You did fairly well with the rolling down hills, so I'm sure you could do it.
Heh, while doing a little Newgrounds portal Night-watch it's nice to see something that's not openly crap.