LOOKS VERY GOOD, guy. I saw a video
Well, dunno if it's intentional, but think you must change some level names (I mean, you've put Green Hill, Snow Hill, Sh*t Hill... XDD) it looks bit repetitive.
And I've noticed you're doing a fast game. I'm doing one too (yeah, I know, faster than your game) and this is a problem for seeing what exists in front. Maybe you must change the game's window size (I had to change it to 400x240, originaly it was 320x240).
Well, just suggesting. Your game is going awesome