Don't support mac lol
Mac users need to understand this one thing: "You have a mac" therefore you cannot play games save for flash games in browser (exaggeration) and begging for support on your OS will be time wasted because the percentage of mac users is trivial compared to the windows and linux users.
Also bear in mind this is a small project and the team can obviously not afford to build on mac, and to be honest why would you because the return might not even be enough to warrant building for mac and even if it is then your game has that mac label added to it so it doesn't look nice anymore.
In conclusion mac users need to learn that "They have a mac" and so cannot play games effectively without them looking like the original Doom. The users on a mac should, rather than take to the forums to complain about the lack of mac support, get out there and earn some money and purchase a windows rig able to run this game (doesn't need to be all powerful) because it is small you can even run it on a laptop.
luv y'all ;)