If anyone's been waiting for the emergence of a "killer app" to justify buying a PlayStation Vita, then Tearaway is your answer. It took a while -- nearly two full years, practically a lifetime for a fledgling console struggling to find its feet -- but the Vita finally has a game that takes full advantage of its unique hardware and which provides a gaming experience unlike any other on any console. Tearaway is the singular game showcasing what the Vita is capable of, and it's the singular game for which it's worth owning a Vita.
Tearaway is, essentially, a 3D platforming game set in a world made entirely of paper. You take control of an anthropomorphic envelope, known in this world as a "Messenger," on a mission to deliver a message to the mysterious face that's suddenly appeared in the sun -- your face, as captured by the front-facing camera on the Vita. You are technically not the Messenger in this game; you are yourself, a sort of godlike figure peering into its world, literally holding the world in your hands. Using your special godlike powers (ie, your fingers) you're able to physically reach into this world and manipulate it, shaping its appearance and helping the Messenger on his (or her) quest to deliver a message to You.
The concept of being a "god" overseeing a world and altering it to your liking has been done many times before. So has the concept of the player being a real person whose computer screen is actually a portal to another world. Tearaway is not entirely unique in this regard, but I've never played (nor heard of) another game that gets you so personally involved in the experience. You're an on-screen character in this game, and every input has you reaching through the fourth wall to physically touch and interact with the world. It's unique, wonderful, and immensely charming, but what's perhaps more surprising is that it's actually a pretty good platformer, too.