shows promise. keep trying
the big problems:
the character slides whenever he moves. meaning, he doesnt stop when you stop moving him.
some of the platforms move out from under the character. he stays in one spot and the platform moves out from under him.
the one-hit-kill thing is irritating, but some games pull it off, so if you want to keep it, go for it.
and, if the wall on the first area that goes up and down is supposed to hurt the character, it doesnt. it goes through him if you stand under it.