definitely not working. with mac you need to zip the containing folder one level up since what is created from the build is a .app package (which windows sees as a folder structure)
so i'm using the itch client and it doesn't recognize the game. Looks like it needs to be one level up in the structure to work. I'd also name the "game.app" the actual game name? On Mac this is a self contained archive and people may drag it around. being named "game" might be too generic.