Seems like a cool game, but I don't have a mac. In unity, you can make a windows build by switching your platform to windows, and pressing build to an empty folder. In this empty folder, the "Application" file is the file that runs your game. If you compress all of the items in this folder into a .zip, this can be uploaded as a build file. Just wanted to let you know how to do this, because even if you don't have a windows device, you can still create a build for windows. Hope your game does well!