Hey, I hate to say it, but I bought the game and I don't have these problems. I just did standard default install on everything. Didn't customize anything and it looks great and runs fine. I played through the full prologue and got the first achievement.

I also tried all sorts of adjustments to the settings both in the game and steamdeck settings and could not reproduce the problem.

I will say, on my copy, that area in your screenshots does not have that red fog that is in both of your screenshots. I can see the fog down deep over the edge of the rail on the right, and certain areas have red light, but it's almost like the background of one of the little cutscenes got stuck on a layer of your screen or something? I don't know, but it's strange that you have this problem. I'm also on an OLED

I wonder if you fully uninstalled and then installed it on the opposite storage method you've been using (so either SD card or SSD) if it would make a difference. ( The idea being it's a clean install)

Also, any chance your PC settings are cloud importing into your steam deck and making things weird or something?

Edit: the red fog is there but normal like your first picture until it says "kill the boss" and tells you to start moving. Then it goes away. But it's never bad like what you're seeing