On a Commodore 64 I created a wonderful little game based in a single room. In that room was a creature, whom you controlled. Every once in awhile, a villager would be "thrown" into the room. Your object was to use various forms of vomit to torment and immobilize the villager, then consume them(getting more "puke points" to spend). The game ran for as long as you were entertaining- then you were killed.

Morbid, yes. Fun? Very!