Custom google assistant commands for home assistant devices

Doable, two parts. The link itself without Nabu Casa is the manual Google Cloud project route, long and fiddly but a one off, and it needs an https address Google can reach. Sounds like you've already done that since on and off works. For movie mode: expose the script to Google in the Google Assistant integration's settings. Scripts show up on the Google side as scenes, so hey google activate movie mode works once it's synced. If you want a phrase that isn't activate something, make a Routine in the Google Home app with your own starter phrase and the scene as the action. Say sync my devices after exposing anything new or it won't appear.