Ran the game for about an hour in WINE Staging 6.21 and had no issues, overall runs great.

Note: First boot up the game did not recognize my controller (PDP XBox controller) however setting the controller up in settings and then restarting fixed the issue).

OS: Garuda Linux
CPU: AMD Ryzen 7 2700X (16) @ 3.7GHz
GPU: AMD ATI Radeon RX 580

Did you have any luck getting the game to recognize any DLC other than the pre-packaged ones? I can't seem to get the game to realize I have both the Dungeon Pack and the Ripuka Pack installed.

Edit: Nevermind, I see what the issue was. I renamed the folders for the game to run them through Steam Play so the DLC was installed into brand new folders instead. Oops.