I loved this game! I still have the original rulebook. That my AD&D 2nd ed. books, Star Frontiers and Gamma World boxed sets may be my most prized possessions.
Gamma World was really neat and timely given how fearful we all were of nuclear war. I remember watching Road Warrior at the time and thinking that Gamma World could actually be the world we live in.
Dragon Magazine would occasionally have articles on Gamma World too. So much food for the young imagination.