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The regenerating cats cheat was my idea; the Tomb of Horrors is supposed to be deadly, but to provide some continuity, I decided that anytime any of the cats died, they would reanimate back at the lab. But, since this was Gamma World, while the name of the regenerating cat would be the same, it would be an entirely different character (new origins, etc.). That way, plenty of characters to run through, and still the same party (for the hand-waving purpose of keeping the narrative somewhat more cohesive).It didn't make it into the article, but half the party fell into lava shortly thereafter.
Copyright does not protect the idea for a game
I think, to be a cat person, you have to appreciate the aesthetics of serene chaos. Taking evil glee in watching your cats torment your friends isn't actually a requirement. It's more of a perk.
Cats + D&D = dancing minis and flying dice