This is my constructive criticism
I can see what you tried to do here but i strongly recommend u dont. The whole idea is very cliche and used way too often in movies (both box-office and flash). If you do however want to do this sort of action flash here are a couple of tips:
-Dont try to save time by avoiding frame by frame animation. (I know this because i am a repeat offender). It just makes the animation look dodgy.
- Make the voices a lot louder than the music .
- For fight scenes (or scenes with any sort of heavy animation) spend a long time on each frame (im talking like 5 minutes minimum. 20minutes for really good ones)
- Use both shadows and highlights in ur shading (makes the characters seem more 3D)
-Do something fancy with some of the violence like slo-mo, multiple shots etc
- Do something unique with graphics such as black-and-white or high-contrast colouring.
Anyway i hope that helped :P
Other than all that i think u have potential in that u obviously know how to use flash.
3/5