I actually made a mock up B&W Mac screen for our previous game, Infested, for fun. Might make one up for Spectacle one of these days. In a perfect world with more time, money and interest we would have loved to have made a retro Mac version :D
Very nice. I say either make a game with half as many room screens so you can have a selectable Mac version, or a game where you travel back and forth between realities and your world is the regular color version but you travel to one where everything including the UI becomes Macventure style... because this style needs to be seen.