Any interesting games that require tilting (Gyroscope / Accelerometer)

I am looking for games where the primary mechanic is tilting or rotating the phone. Obviously, it would be subtle motions.

Not sure what kind of game it would be, but I figure if games exist where you just press "tap", like Flappy Bird, etc., there must be games where you just tilt the phone. Maybe something where you fill something with sand or liquid, or a Lunar Lander type of thing?