The "need more pixels" message is quite frustrating. I get that it might be not practical to support small resolutions, but I was unable to see the demo even on "desktop mode" in landscape on a really big phone. How many pixels do you need? If it's still not practical to support that, a demo video player would be a great fallback.
You are absolutely right, we shall soon make a video for that scenario. For now we just bail if the device has less than 400x600 pixels "big" viewport, and if the "zoom" property is not supported. The demo would actually work fine but we feel the ux becomes too awkward :/