Cool
I liked how easily the loser went down, if he isn't dead it gives him a decent back story to drive him to revenge yet again. You could have continued the story, brought him back as a cyborg or ghost with a vendetta and a significant advantage. The music hyped it up perfectly, the colors were appealing, I especially liked that the blood was the same color as the body, it was stylish. The animation was fluid where they weren't just tweens, but at least you gave them a motion blur. The angles were well contemplated as well.
I was really drawn in, and I thought it was awesome, but it just dropped off too soon.
If I had to guess I'd say you made this a while ago and never continued it, but finally after looking at it again and again you saw it as good enough to submit. I agree, but it would have been better if it were longer.
I've seen your other works, I know you can carry it on more.
Also, if you're gonna give sticks fingers make sure you remember whether you decided to give them 4 or 5 =D