Does that apply to the 2x2 mechanic by itself? Like if I wanted to develop something outside of the fantasy setting of Dungeon Hero and use the 2x2 mechanic (which is ingenious, by the way), are there separate guidelines, or would it be the same as another adventure for Dungeon Hero?
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If you wanted to, say, make a series of sci-fi adventures using the Dungeon Hero mechanics then it would just follow the above stipulations. If you wanted to flesh out a larger game with the 2x2 mechanics, that would be a separate issue. Game mechanics cannot be copyrighted or owned, so assuming it was different enough in presentation and description from Dungeon Hero to differentiate it, it would be your own work (although I would certainly appreciate an acknowledgement if it is heavily based on my designs). If we wanted to synergize and make an "ecosystem" of 2x2 games, kind of like what PbtA is doing, then that might require more coordination. For something like that, we'd probably also need to talk to Button Shy as well, though, in case they want a special exclusion for the stuff differentiated by AdvanceQuest.