Yeah sorry about that. The game definitely needs one of those 'adjust the slider until you can barely see the symbol' like you see in horror games. Thanks for playing.
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...