Quote We have a mac and linux build of the game but its facing a few issues. We'll look into platform expansion after the game's launch is over.

Article taken from GamingOnLinux.com.

I had never heard of ' Valley ' before until it was emailed in by Colin (thanks!), and wow it looks marvellous. It's also heading to Linux!Only a few days ago the developer said this:The Linux content also appears to be in progress, as it has been added to Steam when looking at SteamDB . This could mean they are closing in on it already. The usual applies though, it could still be ways off.I have to admit, I am pretty damn excited to try this out as it looks quite incredible.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.