I have tried launching the following games from GOG that are built using Unity:

• CAYNE
• Enter the Gungeon
• Hollow Knight
• TIS 100
• Tyranny Commander Edition

All of them fail to launch, with the following output in the terminal if manually launched:

Running CAYNE
Set current directory to /home/shadow53/.goggames/CAYNE/game
Found path: /home/shadow53/.goggames/CAYNE/game/cayne.x86_64
Mono path[0] = '/home/shadow53/.goggames/CAYNE/game/cayne_Data/Managed'
Mono path[1] = '/home/shadow53/.goggames/CAYNE/game/cayne_Data/Mono'
Mono config path = '/home/shadow53/.goggames/CAYNE/game/cayne_Data/Mono/etc'
displaymanager : xrandr version warning. 1.5
client has 3 screens
displaymanager screen (0)(eDP-1-1): 1366 x 768
Using libudev for joystick management


Importing game controller configs
/home/shadow53/.goggames/CAYNE/start.sh: line 16:  2957 Segmentation fault      ./"cayne.x86_64"

Games not made using Unity/Mono launch and work normally. The only non-default setting chosen at install time is to install games to a hidden directory ~/.goggames.

I've tried executing with and without LSI (using lsi-exec and disabling it through the options window, respectively) and they don't launch in either case.

I am using an Optimus laptop with the Nvidia drivers installed, up-to-date as of posting. An old Intel-only desktop (Core 2) can open TIS 100 normally. This makes me think this may be an issue related to Optimus, but I don't know where to go from there.

If someone starts figuring out a fix, CAYNE is free on GOG, which should help with testing the fix. I am also willing to help how I can.