Nice side scroller. Graphics were very nice (especially liked the background art and depth).
For feedback: for some reason the main menu felt intermittent. When mouseover one of the options, the font reacted, however clicking the option didn't always start the game. Took many clicks and restarts. When getting caught behind a wall that scrolls off screen (that tall wall before the large scaling pumpkin), it's a slow death waiting for your health to reach zero; maybe an instant kill off screen would be better.
It was neat that you could unlock the different difficulty levels that sped the game up quite a bit. For me, the faster pace made me miss that jump up that wall more often.