We are now in 2023, and Betrayer is on the verge of our "retro" 10-year status. It didn't sell well enough and has been pulled from Steam after the developer, Gunpowder Games, went defunct. Thankfully, GOG has rescued it and is now offering it for free!
https://www.gog.com/en/game/betrayer
The game is set in an early colonial America with a muted color palette that emphasizes its blacks whites, and reds. This works very well with the horror aesthetic as you explore large open areas, facing the ghosts of conquistadors, Native Americans, and other supernatural horrors.

I highly recommend it!