Sonder, is an animated short film directed by Neth Nom and produced by Sara Sampson.
For years, Finn and Natalie walked the same path. But when their time together comes to an end, Finn finds himself lost in a mysterious forest. Paralyzed by the fear of moving on, Finn is at risk of losing himself. Through self-discovery, Finn must gather the strength to forge a new path.
Cartoon Brew has an excellent article on how this film was rendered using the game engine Unity 3D.