The game runs fine for me without any big problem. What does not proper work is my gamepad. It constantly moves in one direction in the menu, log file shows it's loading xinput1_3.dll, so I tried to fix it by installing ...
FWIW, on some configurations it seems to need `PROTON_USE_WINED3D11=1`. i5-5200u / Intel HD 5500 / Mesa 18.2 / LLVM 7 / Fedora 28 (`mesa*` installed from F29)