Also, I wanna turn everyone that loves this game to a movie I found that reminds me of it. The game even makes references to this movie(Dog named Dog Meat. It's what the guy calls his dog in an argument.) It's called "A boy and his dog". Someone told me about it one day, and I am in LOVE with it. It is a little older, and a low budget film, but absolutely awesome. Especially if you enjoyed this game. PLEASE GO WATCH THIS MOVIE! The ending is amazing too. By far one of the best endings is a movie. If you don't enjoy the film, at least sit through it for the ending.
Here's the link: http://www.archive.org/details/A_Boy_and_His_Dog
MINI SPOILER: When they make the reference to screamers, just picture them as ghouls. I'm sure as heck that's what they are.