Is this done in illustrator? I know flash can't pull out the shading of the hills so easily :)

Nice work.

Art needs to be:
6 levels - background + boss(head with 2-3 frames of expression)+tail part
6 items
10 enemies (usually a square/circle fitted object with several frames)
2 pylons - one harmful, one not
player frames - around 10 for direction jumping diying
effects
Menu, intro, win, lose screens