Its getting there
Your drawing abilities are obviously developed. The music you chose was upbeat and went well with the movements of the characters, but without sound effects (swords slicing, landing after a jump) your movie will never be complete. Slick, stylish sword-play is all too common on NG, so more developed backgrounds and objects would help.
I liked the icy background somewhere in the middle, but the beginning and end only had white or akward zig-zags of colour. Static backdrops are anti-climatic. Have them scroll in the opposite of the character's movement to give the illusion that there is a camera moving around the still character.
The blood pool was very childish and could be worked on, but you probably already know that, and there wasn't much care taken drawing the swords. High detailed weaponry WILL stand out!
Overall, I think it was wonderful and I hope you make other Flash productions just as well as this.