I had some issues launching the game. In the end, it worked with Proton-GE though some ProtonDB users say they needed an additional launch command to run the game.
The game runs out of the box on Steam Deck with SteamOS, however, multiplayer does not work.
I used default settings. They allow for fluid 60FPS experience.
The game runs out of the box on Steam Deck and is optimised for the device (e.g. mentions the use of trackpad).
I received access to the game for free from the developer.