Not bad
It was dark, the effects were cool and the music went along very well with it.
But the drawings and animations were not very good. Honestly if I could choose between a flash with many special effects versus one that has a bit more time spent in animating/good drawings I would go for the latter. I can not feel quite as emotionally effected by something as stunning as murder when the animation is too simplistic and the colors very bright.
Go for a darker color scheme next time you do a dark story, give me the mood lighting and scenery that will draw me in.
And I ahve nothing against anime style drawings but triangle heads are a bit much. x_x