Proteus is simple. You walk, you listen, and you watch. It's only about an hour's worth of content, but it's an incredibly cheap game. The music is top-notch, and the art style is incredibly charming throughout all four seasons.
While Proteus probably won't appeal to everyone, it's an example of how varied and weird games are now that digital distribution has taken off. This is a low-stress game, and I enjoyed myself the entire time.