I think it kind of depends on what audience this is for. If everyone who plays this hack has played AW, then yeah, Apocalypse Dungeon is cool. On the other hand, if this hack is more of a stand-alone thing, people are just going to be thrown off by it. I talked to my brother about "Apocalypse D&D," telling him all this cool stuff the game has, and his first question was "so what was the apocalypse?"
I think this hack has legs of its own, so I'd prefer a name that didn't confuse people not familiar with AW.