I remember this happening a long time ago on a laptop maybe, no idea how to fix it on the steam deck. Ive installed via lutris and everything's working great except the darness is pretty polarising. Any ideas on a fix?
I selected DX12 in the Ephinea launcher after launching in game mode, but still get the dark floors. I don't have any off the other enhanced graphical options enabled like antialiasing, ambient occlusion, ....
Edit: I ended up following this guide instead and it fixed the problem. I swapped to DX11 after finsihing install. I can now run it in game mode with no issues other than having to do some extra mapping for keyboard stuff.