The dark in the subway could deserve to be less dark; I was unable to see anything outside of the circle, and was convinced it was pure black until I watched someone else's playthrough. Even then, I still had to go into my graphic card's setting and raise the gamma in order to see anything and make it through.
I've fixed the game so that darkness is now brighter, would you be able to test this on your monitor? I've linked to a specific version so you won't have to start from the beginning.
https://drive.google.com/file/d/1QGBe_WYeYVl1PM1M6yVSbOX0DAouwC7U/view?usp=shari...