I'm always super interested in these kind of tools. Unfortunately the demo movie isn't loading for me, not even when I directly browse to the source url.
I'm assuming you're on mobile, so later today, I'll try making a separate demo video specifically for this case.
It did seem like for most of you pr demo about half the screen is blank. I think you could easily reduce the resolution by 1/3 and not confuse the demo at all.