Lemma

"Lemma is a single-player action game with a good story and perfect mechanics, offering immersive first-person parkour in a surreal, physics-driven voxel world. Creativity is key as you build structures by moving through space, and with non-linear storytelling, there are four possible endings. The game also includes Oculus Rift support, time trial mode, a built-in level editor with Steam Workshop support, and a soundtrack by Jack Menhorn and Ashton Morris."