NoxTM: I'll give Rex Nebular and the Cosmic Gender Bender a go! And my favourite game is deffo Unreal; I think I've mentioned it before. Honourable mention to Nox™,
obviously, but nothing beats Unreal's sense of a real world, as the majority of levels follow on from each other in a really organic way. It doesn't hurt that he music is amazing, either! And if it does, then bring on the pain.
Enjoy it! It is one of my favorite adventure games, though certainly not one of "the best", still an absolute favorite for flavor, social commentary, uniqueness, and killer death scenes (I recommend seeking out every single way to die in the game and watching it happen, remember to save first!)
Congrats all!