Hello @WillHaRSI, please add PROTON_LOG=1 %command% to the game's launch options and drag and drop the generated $HOME/steam-$APPID.log into the comment box.
Separately, at a glance this looks like a side effect of mesa/Intel/Ivybridge's incomplete vulkan support. Please put PROTON_USE_WINED3D=1 %command% in the game's launch options and check if it improve's the game's behavior.
"PROTON_USE_WINED3D=1 %command%" fixed the problem. Can confirm works fine on Radeon GPUs. This ticket can be closed. Thanks.
PROTON_USE_WINED3D=1x2 2018-11PROTON_LOG=1x1 2018-11PROTON_USE_WINED3D=1 %command%x2 2018-11
Compatibility Report
System Information
I confirm: