The launch options and Proton version are not needed to launch the game. I just like using Feral Game Mode for all my games so things run smoother and I like using Proton GE on all my games as it has fixed major issues I've had before.

I had to install the wine-mono package to get the game working because it needed the .NET libraries in that package. Fortunately WINE threw that error at me when I tried to launch the game (through Steam or the terminal) otherwise I wouldn't have known how to fix the issue.

I did have a further issue after installing wine-mono as I think it's like updating user groups and you need to log out or restart the computer to update system variables so things will work properly. After I restarted my computer things ran just fine.

Perhaps there is a way to manually update it without logging out or restarting but to keep things simple and brief I'm going to leave it at that.