The Mac actually got something called Mobile Suit Gundam 0079: The War For Earth back in 1997 or thereabouts; a full-motion video Dragon's Lair-type twitchfest which, by all accounts, was highly underwhelming. It was buried by the distributor upon release, and I have never seen a copy for sale in 13 years.
Beyond that, you're limited almost strictly to console games, most of which are supposed to be pretty terrible as well. I can't imagine a scenario in which a Gundam property ever makes it onto the Mac again; the demand simply isn't there.