Whizbang Dustyboots
Gnometown Hero
Hasn't leveling been part of every version of Gamma World to date? Arguably it shouldn't be -- it could probably be best-served by a game that has no leveling or improving at all, beyond just gearing up -- but it's not a new issue.I think D&D basics could allow Gamma World with the appropriate mutation rules, but I don't know that the level/class focus and the other emergent behavior from the foundational rules actively supports the feel of Gamma World.