The listing, Nighttime Terror VR: Dessert Defender - Steam Key has ended.
Oculus Rift is supported via SteamVR/OpenVR
To enable support for Rift, please opt in into the latest SteamVR Beta and follow these instructions:
https://support.steampowered.com/kb_article.php?ref=3180-UPHK-0900
After enabling Rift support in SteamVR, just launch the game from SteamVR or the Desktop client while SteamVR is running. You will need an Xbox 360 or One controller to play the game in seated mode.
Please Note: If the game eventually becomes available on Oculus Home, you will not be given an additional Oculus Home Key. Leaderboards and friends list may be platform dependent.