I see these comments are months old but I posted the following on another question like this:
I'm not sure how to confirm but since this was published in 2016, the reason we Mac users can't run the application is almost definitely because it's built for an older Mac OS. So basically, this game is no longer available for Mac unless you go through the trouble of running an old OS. I recently read that there's two big reasons that so many developers don't bother with Mac support. The first and more obvious is that Mac users make up a very small percentage of gamers, and the second is that any time there is a Mac OS update, even minor ones often, games need to be updated to accommodate them.