err:quartz:GetClassMediaFile Media class not found from the log looks like the game is trying to play a video with quartz.
I believe this is an issue with newer Unity3D games. I've encountered a similiar issue in Dry Drowning Demo and A Place for the Unwilling.
The game is playable now. The videos finally play with the current proton experimental however the videos play upside down. If you could fix that it would be lovely.
I thank everyone involved for the good work done so far.
proton experimentalx1 2022-08
Compatibility Report
System Information
I confirm:
steam-762830.log
Symptoms
The game demonstrates only black screen and background sounds
Reproduction
Start the game.