

Switched to GE from get go due to valve listing it as unsupported. Launched fine. Took a bit of time to load the launcher.

FPS limit set to 40
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The launcher has some errors; one reported by a previous person ("Error: could not load the correct language. Please delete the settings file and retry. (Documents\My Games[Game Title]\Launcher)"). But trying to click the settings cog in the launcher also returns a .Net Framework error - presumably as I don't have Mono installed. The game then will not load at all if this error has been triggered - but, terminating and re-running the game without triggering the .Net Framework error it worked fine.
Works just fine with Proton 5.13. If you aren't sure, they have a free demo, give it a try first.

The game is impossible to play without a sight on the board. I don't know if it's due to my computer specs or to the proton conversion.
I could see the layout with the diver and the inventory and even use it but not the main window of the game with, I suppose, a board on which actions should be assigned to the character (using Proton 5.13-5). Using Proton Experimental, I couldn't even pass the loading screen after the play button.
The game was running at 30fps in the menus and 15fps in game.
While launching the game, an error message appeared stating: "Error: could not load the correct language. Please delete the settings file and retry. (Documents\My Games[Game Title]\Launcher)" I just pressed ok and nothing seemed to be wrong with the language.