Lot's of potential here. Great graphics and style right off the bat. Could use a few more moves such as double jump - make this into a collectible? The bottom pipe doesn't seem to work, I got stuck down there.
Things to work on:
Turning speed - increase
Movement speed - decrease
Boundaries - so players don't fall off the world
Sounds and music
interaction with the environment other than the coins
 "The Wizard"){kind=icon}
 "Polyko's Super Jelly Bean Quest in the Sketchbook of Illusion"){kind=icon}
 "Get the coins"){kind=icon}
 "DexLand"){kind=icon}
 "Little Wheel"){kind=icon}