Well, this seems a lot like some kind of an alpha stage of development. It was filled with glitches and oversights, you could jump in midair, the graphics were straightly ripped, and the crouching just made the door smaller and made it drop through the floor.
Music: lolnope?
Graphics: 0,5 stars, ripped from mario and a random badly shopped picture of a door - that sucks
Gameplay: 0,5 star - the engine seemed pretty good, liiitttle bit of fun some times
Conclusion: Yeah, develop it a little - no, a lot further before posting a piece of crap like this to newgrounds.