Beta tested the game on Steam Deck using Proton 9.0-4 (Stable) and experimental, and they work right out of the box, as long as you use Touchscreen Mouse Emulation, Keyboard (WASD) & Mouse, Web Browser.
The game needs drivers/input regonigition for game controllers like the PS5 and Xbox using bluetooth, cause it's not properly configured, but other than that the game does slow the big picture mode down a couple of bits when opened by pressing the steam button or 3 dots button, due to too much GPU utilization.
Great work like always, and I'm more than happy to help if needed!