It was just 2 Days ago when I first Used unity and whoever would have thought Id have a VR Coaster APP after just 2 days.
U used some existing unity asset?
I think just the terrain. The coaster was purchased from asset store for 6 bucks but you can change colors of textures, etc
On google play for 1.99 already have 1 sale already.
Also google has cardboard Unity SDK with camera so its easy to setup, just drag in the camera head and camera to your scene and your good to go.