Clearly, Roto thinks a "2D game" refers to a game with 2D graphics, while the prevailing definition is a game with 2D gameplay. And in that case, it's an argument of semantics, and neither opinion can empirically be called more correct than the other. In other words, let's go back to naming excellent 2D games, and those of us with freako irregular interpretations of the subject, desist in imposing them upon others.