Each time you play the game, you know you're just going to die and start all over. Basically, the fun is seeing what changes each time you play through. The story is odd and kind of upsetting if you know what the heck's going on, the monsters look more sad and degraded than ferocious, and the only friendly character in the game curses like Linda Blair and berates you for not being dead enough. Some characters get depressed and BURY themselves in the dirt. It's a gloomy, repetitive game.
And yeah, it's intended to be fun, to the kind of person that enjoys this sort of thing.