When I open it as described by you I simply get a monsters text file of code.
Any help would be greatly appreciated.
I'm on Big Sur (11.3), but I think the process is the same—I've had to do this on an older MacBook as well:
Try to open the game by double-clicking on its icon, then close out of the ensuing "Apple can't check app for malicious software" popup warning. Now open Preferences > Security & Privacy > "General" tab. (And unlock the panel first, of course, if your Mac is password-protected.)
At the bottom of this preferences screen, under "Allow apps downloaded from," there's a note that your computer is currently blocking wohgame. Next to it is a button that says "Open Anyway." I don't think you have to do this every time, but maybe you do? Best of luck.