There's a bug which prevents you from finishing the game. If you make it past the acid pit, get chased by a robot and leave the floor, when you come back later it won't scroll left and right anymore and even though you can disable the robots, you can't see where roger is walking and you can't click on vohaul's door (because the background refuses to scroll away from the middle of that floor)
oh well. guess i am not finishing my game