Lucius is a horror game where the son of a rich family (no puns intended) suddenly becomes psychotic and starts killing everyone in the house. It actually follows the story of a young boy who apparently made a pact with the devil (or so it seems). The main goal of the game is to basically kill people in different ways.
I think what makes this game stand out are the visuals, to be honest. It's not that this game has the best technology in the world or close to it but the design is good and the gameplay can be really fun.