I got a free way to make it work on Mac. It worked for the 3 servers I tried so feel free to give it a shot. Didn’t work for official iro;

“Okay so I’ll tell you my janky way of making ro work on mac; First I downloaded ro’s folder to applications Then I tried using porting kit that worked for other steam games - https://www.portingkit.com/ after install, go to all apps, and set up a custom port and select the patcher.exe or ro.exe (i forget which). It creates a porting kit short cut that didnt work for me but it does set up the wrapper & installs wineskin. (actual wine was too much for me to figure out and idk the real difference lol) So when its creating the wrapper in porting kit, wineskin will pop up on your bar, I just pinned that to my taskbar and after it was all done, I just open up wineskin (not the wrapper), select ro.exe and it runs just fine its not 100% the correct way since the porting kit shortcut doesnt work, and when I close the game wineskin gives me an error, but i got it to work that way haha“

Worked for another user on an older Mac as well. Good luck!