I think DF is pretty genre defing, I mean really, DF basically created the genre of "building games", though Minecraft holds the title because it's so popular. But if you think about it, Dwarf Fortress was the[\b] first building game, and as much as the Minecraft fanboys would like to argue, DF heavily inspired it, and the never-ending flow of building games that came after. Including Terraria, Fortress craft, and a ton of others. It also is an early example of a "bad graphics good concept" game. Before that, it was all "graphics", once again, A la Minecraft.