Decent
You attempted an age-old concept that still has potential if done correctly. I saw some good things, and some bad:
+ The blood and gore was animated pretty well. I noticed some nice highlighting, and bonus points for camera lens splatter.
+ Good use of Actionscript for a scene selection.
- The art could be cleaned up quite a bit. There were plenty of raggedy lines which gave the flash an overall 'unrefined' appearance.
- The animation was choppy at parts. Raise the framerate or work on creating more 'middle frames.'
So, it was a bit of a 50/50. Keep working on smoothing out that animation and getting a feel for drawing with the mouse. Good effort for a first. [3/5]