
Didn't launch on Nvidia hardware (Microsoft C++ error at first, then Unreal Engine error when I switched to Proton Experimental)
VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/nvidia_icd.json gamemoderun %command%
Works for me on Nvidia with the arguments I put (maybe even with Proton Experimental, even do I used GE here)

Switched to Low to have bearable framerate online
Proton Experimental seems to be a must to play

Using default settings game won't open, asking to install Microsoft Visual C++ Runtime. Using Proton Experimental game opens, but videos won't play. GE Proton was the one to play it perfect. Steam Deck have to play it on low setting, game is too heavy atm.

Game crashes and shows crash reporter
d3dcompiler_47

The first time after installing the game I had to start it twice for it to properly log me in and allowing me to setup my game name. This might be related to it being a prototype still and not stricly linux though.
After that everything worked perfectly and the issue never appeared again.