I used to love this game, although the last level with the spikes and pushy-out walls was more luck than skill (i used to jump constantly in the vain hope of fooling the collision detection, not sure if it worked or was just chance).
There were a few places (the coveyor belt for one, and the big guy near the bridge as well) where you could trick the enemies into running off the edge and killing themselves as they tracked you in pretty much a straight line.
If you were really sneaky, you could get some of the weapons to follow you when the screen full scrolled between sets of enemies rather than loosing them, if I remember correctly you chucked it forward as the last bad guy in that scene died.
Wasnt this the sequel to Renegade?, another violent head kicking game.
The Amiga version of DD2 had really good music if i recall.