I know someone else made a thread about running the game on gnu/linux here, I'm not sure if it'll work in your case but I know they experienced and subsequently fixed that graphical glitch and got the game working. https://itch.io/t/3508853/how-to-run-on-gnulinux-probably-any-nix-system-works-s...
Viewing post in Help with using Proton-GE to run game on ubuntu
Thank you, using that and an extra guide to properly install DirectX End User Runtime like the install instructions say on the game's page (guide being https://www.dedoimedo.com/games/wine-directx.html for anyone else also having trouble with this, for the link in the guide with the ddl list use the wayback machine otherwise it's a blank page) i finally got the game working on wine instead of having to use proton, i can now finally enjoy this game on linux!