This is an iPhone VR game you can play with your Apple Watch.
Ever played VR game with additional remote controls on your hands? Now, Apple Watch is just the remote control for this VR game!
While you can rotate your head to look around with Google Cardboard, you can take use of the newest features of WatchOS 2 for Apple Watch to play the game.
The game's 99% done, except for submitting to App Store. Currently I'm not able to submit the game due to a bug on Xcode beta 4. Let's see when the WatchOS 2 is available and the bug is fixed.