From what I could gather, the only thing that kicks the bucket for the game is .NET. However, a user on Github, namely Izalia Mae made a script, that downloads, installs, and sets up .NET 3.5 with WINE, and WineTricks, for the game to run. His/Her install script can be found down below. Other issues, such as missing textures, as I understand it, might come from DXVK, and instead, you should use D9VK. But for one, the game uses either Dx9 or even Dx8. So while D9VK should be more appropriate, it may or may not really. Tho it shouldn't be much of a problem, to add the "PROTON_USE_D9VK" flag to launch options for the game. I have yet to test it with D9VK, and instead just used the python script, to solve issues with .NET, but I guess, I know what I'm gonna be doing next time. Oh, and there's also the issue with Fullscreen. Upon first boot, the game defaults to 1024x768, fullscreen, so after the tutorial, you should really change that. If your just gonna sit down, and ignore the world for a session, I guess the inablity to Alt-Tab out of the game, when fullscreen isn't gonna be a major issue. But for others, I reckon that Windowed mode, is what they need. Unfortunately, there's no option for 1600x900 for example, which is my preferred resolution for a game in windowed, on a 1080p monitor. Still, 1366x768, while wacky, it still works just fine. Github page for the python script (just download it and follow the given instructions): https://git.barkshark.xyz/izaliamae/pt-launcher