Demo or prototype?
There is lots of space for improvement if you want to make a decent game.
1: Bigger view. The view is too close, you can't see much.
2: Figure out how to climb ramps. The character can't climb ramps with the move right key alone.
3: Make enemies and weapons.
4: A little more depth? Give it a plot and maybe rpg elements so people can jump higher, have more powerful weapons etc.. That's always good.
5: Better movements. The character just wiggles his feet when he moves, you have good graphics already so I think you could do that.