A very nice game! The controls were spiffy and clean (although maybe jump and down to fall through platforms). The sound was perfect, and the music was catchy. The animations of the flying pumpkins flapping disconcertedly was very nice. The level design got a bit confusing after a while, but good job on teaching that you can wall jump the way they did in Mega Man... making it so you when you get to the first place you have to do it, it's almost impossible not to do it by accident.
Unfortunately, I had to quit because I got stuck in a little alcove and my character stopped being able to move. Besides that, I really enjoyed it.
EDIT: Oh, also, I had to download it because the HTML version hung up on the title screen.