After about 45 - 60 minutes of play, there is a slight stutter that does not go away. It happened every single time. The game is still playable though and after restarting the game, the stuttering is gone again.

There is a bug in Level 4. When you go inside the model train and have to turn the valve handles. Not sure if it is a Linux/Proton issue or just a graphics issue, but the gauge cursors were moving way too fast in my case. Turns out it was because I am running more than 60hz on my display. BUT, I also had to use Displayport to get it working correctly.

Tested:

• HDMI: 60hz - 165hz -> Gauge cursors were moving so fast that it was impossible to get both to the blue zone, which prevented me from advancing in the game.

• Displayport: 144hz-165hz -> Also too fast

• Diplayport: 60hz -> Worked fine

Rest of the game was playable fine.