Just downloaded, played seven games and… want my money back.
There are no customizations available, apparently, for the Mac. There is talk of tile choices, though there are no such options, apparently, for Mac. (And I find the default tiles somewhat difficult to read.) Likewise theres talk about background choices, but not, apparently for Mac. I cant even find a way to select the layout, which, I must say, is rather tiresome. On the plus side, game noises are not annoying in the least.
Ezmoe about
Shanghai Mahjong