I managed to get the game's textures working well through Lutris with this script I found!
https://gist.github.com/baryluk/1041204eff4cc4fad6f1508afe67b562
It'll compile and install latest mesa, just make sure you add the wrapper script to the command in the lutris config for the launcher and it should work great.
Managed to make it work first try with this script on my KDE plasma/debian testing setup after wrestling with the textures issue for several days.
I made a service for this a while back:
https://github.com/MattMckenzy/Homehook
However, development of it has stopped in favor of v2, where I drop Chromecast support and instead focused on making a companion player service running on an htpc or rPi.
Let me know if you have any questions, I can try to help!