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Alright, Google just update the Daydream VR App collection. Now you can find both "AFFECTED - The Manor VR" and "Inception: VR & 360 Videos" directly in Daydream App...
By the way, here is another App that shows up in the installed apps list when in Daydream but not listed in Google Play Store VR, this App using gaze to highlight and click the touchpad on the controller to select things - Art Plunge Preview: https://play.google.com/store/apps/details?id=com.spaceplunge.artplungedd