You've made an amazing demo. BUT you need to finish it- c'mon man, it's like you made us a delicious appetizer then forgot to give us the rest of the meal. It's actually worse than giving us nothing at all!
Also, you should add a 'pick up' button- it'd make getting weapons/tossing enemies around a lot easier. Yeah, I know, the NES version didn't have that but that was only because they only had 2 buttons to work with.