Here's the walkthrough for level 8:
Avoid attacking S'asshole in close combat first, then get all power-ups and make sure he doesn't get them. The AK-47 mostly appeared in my run of this game. So use the AK-47s at the top of the tower.
Hope it helps.
GashJunk - Place enough blocks until there is a small space then do the same for the other.
When its the rectangles, Place them with the left rectangle's right side has more and be sure for the left side of it to have enough space for the blocks. Do this for the other. Stack the number of Blocks at both sides and there you go.
Well, I'm stuck on 36. The circles keep rolling me out.