Outstanding puzzle game, a bit pretentious with the use of common philosophy, trying to say something about... life?

Nonetheless, one of the best uses of first person shooter conventions out there, somehow requiring a certain amound of precision and reflexes while having geniusly designed progression and mechanics. Your head is always in motion, taking full consideration of your surroundings in a way few games achieve.

And the artstyle, completely monochrome and still managing to have a flavour of its own, almost ethereal, inmersing you in that world of visual plays on perspective. Intelligent.