As some have reported...with Proton the fonts in story mode are not correct. The intro movie and special/ex move animations do not work. Although there is limited remap within the game, a controller buttons cannot be remapped because KE's included controller configuration utility does not work even though Proton includes .NET. In the past before trying Proton I've successfully played many hours using PlayOnLinux + winetricks in a 32-bit WinXP wine prefix with required DLL components: d3dx9, xinput, wmp9, wmpcodecs, corefonts, gdiplusDX9, and .NET 4.5.