Kart Racing Pro in Steam using Proton is working. Not a huge fan of Windows but love Linux and I'm extremely happy that KRP is working!
Any question feel free to ask.
I've been running Piboso creations on linux for years now. No problem really.
I have been also, since alpha using wine.
Steam/Proton gives another option for those who are terminal ignorant. With Mesa-Vulkan drivers it has come along way.