Well, it wasn't bad...
I'm not a huge fan of the stickfight flashes, so take this as you will.
Of the stickfighting flash animations I've seen, most every one progresses like this...hero fights weaklings; hero fights a couple tougher folks; hero fights boss, struggles, wins. There was nothing really outside the mold here for me. Doesn't end there, either...
Background - a couple levels to fight on?! Wowwy zowwy... How about an background that is varied, interesting and can become part of the action (more so that just as a surface for bodies to land against).
Action - Just a little too repetitive for my taste. Lacked too much variety.
Sound effects - Why did it sound like breaking glass when he defeated an enemy? Was that intentional, and if so, I was just curious as to why. Also, some of the sounds were staticy, and I have some decent speakers
Enough complaining! Honestly, your animation was good and I liked a number of the things you did! I just like to criticize harshly, because what is a review for, if not to give creative criticism to the creator (because these reviews certainly aren't for the benefit of the viewers). I could spew meaningless praise, or actually care enough to take the time to write this. I think, if you really put your creative juices to work, you could come up with something original and awesome! Keep up the good work, and strive for excellence!