Bad news captain, unzipped it and tried to open, got:
“Fatty RPG MAC v0.052” is damaged and can’t be opened. You should move it to the Trash.
I know from my personal experience with getting RPGmaker games to work on mac, you can take a game that you know does run, go in the files to Game -> contents -> Resources -> app.nw, then scrape everything that's in there out and swap in the files from any other RPGmaker game, and it'll run. Dunno if it'll really help, but I figured it's worth letting you know!
(I'm pretty sure this is a Unity game and not RPGmaker but "maybe seeing how a different Unity game's mac version works would be helpful" is the thought process here)