Thanks for playing! I've been meaning to make a native linux build, but my linux steamvr setup is broken at the moment. Did you have to do anything in particular to get it to work with proton?
i used this launch command in the game properties on steam, some of it is related to the laptop im playing on having an intergrated graphics hybrid thing, it mostly might be the second command that fixed it: MESA_VK_DEVICE_SELECT=1 PROTON_NO_FSHACK=1 %command% --rendering-driver vulkan