HTC Vive, & Oculus Rift
You can buy the game for Winows, Mac, Vive, and Oculus Rift via this website on either the Steam or the Humble Bundle store.
Nevermind can be purchased for Oculus Rift directly from Oculus Home via the link below.
Nevermind is available for Xbox One in several regions!
Note: The Xbox One version of Nevermind does NOT include biofeedback functionality.