interesting
I agree, you need to make it also allow the asdf keys. Another thing, you should be allowed to jump through your own lines. Also, it might be good to have an item to blows up the evil ball and delays it for say 15 seconds. music. you need music to set the mood. also add sound effects for jumping, walking, the proximity of the evil ball and for falling.
it'd be a whole lot better with those changes.
good job.