From IndieGames:

From FingerGaming: Ruben & Lullaby is a story you play like a musical instrument. Two lovers are fighting. You can control what they’re feeling, where they’re looking, when they speak, and when they listen. Tilting back and forth triggers the cuts from shot to shot, advancing the story. Your actions conduct a moody jazz soundtrack that reflects the feelings of the characters as they change in real time.

I love the idea, the interface, and the dynamic music changes, though it’s difficult to tell how linear the storyline is.