View drifts. No apparent way to re enter – Proton Pulse for Google Cardboard Review

The game seems very fun, but the view drifts to the side. Over time. After five or so minutes, I'm facing 90 degrees to the side of where I started. There is no apparent way to recenter the view. I have to force close the app and start over. Please fix! Please offer a way to recenter the view!
Review by zachbud on Proton Pulse for Google Cardboard.