This app was mentioned in 4 comments, with an average of 2.50 upvotes
I enjoyed VR cosmic roller coaster app
VR Cosmic Rollercoaster - The app I always use to introduce people to VR. Very responsive, immersive (sound could be better), minimal interaction.
Chair in a Room - Cool story, short, scary, very immersive. Sit on a chair in a dark room while you play this, and you'll forget you're in a game.
Cardboard VR Experience - This isn't technically a game, it's like a short tutorial/preview to show developers how they can maximize the VR experience. It's really beautiful, 3D+spatial sounds, etc.
Titans of Space Cardboard VR - Awe inspiring view of space, zoom between planets, educational, planetarium style voice over as in-app purchase.
Deep Space Batfle VR - Haven't tried it, but heard it's the best proper game utilizing VR.
VR Theater for Cardboard - The best app to watch features length movies, accepts loads of different formats (2D, 3D SBS, 360° videos, 180° videos), can change scaling, aspect ratio, seat position, height, distance from screen. And lots more options. And it's completely free, and better than most, if not all paid VR video players.
Cosmic Roller Coaster does this for any android device.