Needs work
I will say that the sprites were pretty well developed, but it wasn't much besides that. The glitch with how you could jump off the screen so easily was pretty annoying. There was a certain point where I couldn't go past a screen, which I guess was part of the demo. This had some good ideas, but it certainly needs more variety and better control. Seeing as how this was a demo, I would be eager to see new developments you make. You could add in a more detailed background.