I recently finished playing Tearaway, & damn it’s one of the most amazing games I’ve ever played. It doesn’t so much break the fourth wall as disregard the concept of walls entirely, & you yourself appear in the game as a mighty all-seeing god looking down from the sun, with the front & rear cameras of the vita bringing bits of your surroundings into the game.
It utilises all the features of the vita as well, you tap on the back panel to give the character a boost, peel things aside using the touch screen, record sounds with the microphone & take photos with the camera, tilt the console to move platforms, create things by drawing them on the screen & cutting them out. And as you go you can collect items that unlock templates to make actual papercrafts you can download.
All that & it’s a huge amount of fun, & while tricky in places, it’s never actually frustrating (except getting the last few bastard bits of confetti on The Tear -_-). And it’s imaginative & uniquely designed, with cute things like being able to take in-game photos.
( Making use of the in-game camera )