In Space Quest 1 VGA (not EGA) can you kill Orat with the Spider Droid, as you can in the EGA version? I know in both you can kill him with the dehydrated water bottle.
Yes, you can. If I recall, you have to lure the spider drone into the Orat's den, and then hide behind the rocks at the left/bottom of the screen.
Here's a video, queued up to the point where he lures the spider drone into the den: