This could be so much more...
Alright, let me start off by saying you have a very good idea on your hands. But there were many, many flaws in this.
1) The "punching sound" would go off when you are no where near your enemy.
2) The [CTRL action] teleports you backwards when you are moving forwards (pressing the right arrow).
3) There was no variation in any of the characters.
4) There was no music, and only one sound.
5) There are only four things you can do in it: Punch, Duck, Jump, Teleport.
6) It seemed very rushed and sloppy.
Keep in mind, I'm not flaming you, since I can see that this flash has alot of potential (besides the fact that I was one of those who voted to protect this flash), but just pointing out the things you need to fix in order for it to reach its potential.