I like the cinematic approach!
I really like the emotion your flash gives! However, there's a few things I have to comment on:
-The music seemed fitting, but the song was certainly flawed. Someone said it was from "Samarai Shampoo" or something, but the singer kind of distracted me from the movie.
-The lack of sound effects was really painful. I understand you want to keep it silent for climactic tension, I agree with you there. But maybe it'd be cool to have some sword clings and a final stab sound effect? That'd really seal the deal.
-You art is really unique. I like the style. You could slow it down a little, and use more frames for each animation I guess. It almost reminds me of a flip-book. But in a movie-sense. I liked it.
-The window was pretty small.
-I didn't like how the white/paper background would disappear and reveal that stone grey texture every now and then. Kind of distracted me.
-A little storyline might be nice. Unless you just neglected that because it's a test.
My review seems harsh, but I'm too lazy to put all the good things :). It really was a great flash. But I just threw out some things that might make it a great flash movie. It has potential! Keep it up.