Blue Isle Studios (Slender: The Arrival) announced today that Valley, their first-person action-exploration game, is coming to PlayStation 4, Xbox One, and PC worldwide on August 24.
In this gameplay video from IGN, you can see the first 20 minutes of Valley, which places you in a remote region of the Rocky Mountains, using your recently discovered L.E.A.F. suit to run and jump through the forests and ruins as you attempt to find the Lifeseed:

Here’s the description for Valley:

Valley is a First-Person adventure unlike any other. Hidden deep within a remote region of the Rocky Mountains, you find yourself bewildered within a secluded valley. With the power of a recently discovered L.E.A.F. suit (Leap Effortlessly though Air Functionality), run and jump your way through beautiful forests, dangerous ruins and vast environments; all the while utilizing the power to control life and death to uncover the startling secrets of the mysterious valley. Be forewarned, with these new-found abilities comes a daunting repercussion: the more you experience death within the valley, the more the valley will die around you.
Features

Move faster, jump higher: make your way through the world of Valley using the incredible speed and agility of the L.E.A.F. suit.
Manipulate life and death: the L.E.A.F. suit grants its pilots the phenomenal power to both give and take life from any living thing.
Experience a unique twist on death: the more you die, the more the valley will die around yo...