Hi,
Some of the cavern / basement environment are so dark that I have difficulty seeing objects and monster.
Almost every game I know can adjust their "gamma" level, helping the few of us that have difficulty distinguishing darker colors.
Right now, I make dew with changing my brightness and contrast on my computer screen ... to change it back to regular settings once I get out of the game.
Hope you can put a "gamma / brightness" and "contrast" meters that we could change in the "video settings" of the game. It would be easier for us all.
Thanks.