Looks like Cell Shading!
Great work, there was some lag the first time it played on the heavily animated scenes (troopers kneeling down, Robo going akimbo on their asses). The second time I played it (rewind button) it got smoother with minimal bumps, nothing major, but noticeable. Also I cannot see Robo's barrel at the end, the screen goes black too soon.
Excellent work though I never even imagined that this kind of quality could be achieved in Flash.
Bravo.