The atmosphere in Penumbra was top notch. Then I kept getting killed by a badly textured demon dog and I quit in frustration. I should probably go back and try playing through again, but the pace (not to mention lack of combat) of the game takes some getting used to for this long-time FPS junkie.
"The assumption that animals are without rights, and the illusion that our treatment of them has no moral significance, is a positively outrageous example of Western crudity and barbarity. Universal compassion is the only guarantee of morality."