• Summary / Title: On my 2015 iMac, running Mac OS Catalina, the game displays streaks and other artifacts constantly during the game, eventually leading to visual blowout after about 10-15 minutes of play
• Description: The game worked perfectly on my Mac before Catalina and pre-patch. Now it has streaks and artifacts on-screen constantly, eventually leading to some screens becoming unusable due to blowout, disappearing elements, etc.
• Steps to Reproduce: turn the game on!
• Reproducibility: 5/5
• Expected Behavior: the game should run smoothly with no graphical glitches
• Version: current version (steam auto-updates enabled)
• Notes: The static loading screen when first starting the game is unaffected by the graphical glitches
• Attachments: none

It's possible the new patch relies on assets from an update. Make sure all your OS, Catalina, and graphics drivers are up to date.

Eulogos wrote:

It's possible the new patch relies on assets from an update. Make sure all your OS, Catalina, and graphics drivers are up to date.

All graphics drivers, etc. are included in all Mac OS updates. You cannot update them separately on Macs. In essense, this means that the OS, Catalina, and graphics drivers updates are all the same thing - which I already have. I'm hoping for a response from the developers, or their tech support people, to give me some idea if I can ever play this game again.