Install winetrick/protontricks:

• sudo apt install winetricks
• sudo apt install python3-pip python3-setuptools python3-venv
• python3 -m pip install --user pipx
• ~/.local/bin/pipx ensurepath

Restart the terminal and then run:

• pipx install protontricks

You must have launched the game at least once before performing the next step:

• protontricks 339340 wmp11

With Proton Experimental some backgrounds were not rendered making the game unplayable. Using Proton GE the graphical artifacts were minimal and only when inside the train. All other levels of the games were fine (with the exception of the elevators scenes).