"In Windowed Mode On A Mac (Catalina)

It turns out there's a way to run some steam games in window mode. This is helpful for playing low-res games on a large screen.

Not for the faint of heart, but here are the steps:
1. While running the app, right-click on the icon in the dock and select Options > Show in Finder
2. Right-click on the KathyRain.app file and select "Show Package Contents"
3. Navigate into "Contents" > "Resources"
4. Right-Click on acsetup.cfg and open with TextEdit
5. Near the bottom look for "windowed=0". Change the zero to a one.
6. Save the changes and exit out of TextEdit
7. Close the finder window
8. Close/quite the Kathy Rain game.
9. Relaunch Kathy Rain
10. You'll be asked to sync either the server to your local copy or your local copy to the server. Choose to sync your local copy to the server.
11. It should now launch in a mac window that you can resize.

NOTE! I am not responsible for any damage or misconfiguration that occurs to your game if you choose to do any of this. I'm just posting it as a courtesy of what worked for me.

Cheers!"