That Alien has moved in on our street - or someone very similar!
Bet the Alien has better manners though.
Anyway, about the video:
The physics facts seems fine and yes it would be a good way to talk about heights.
For presentation it would be best to try and improve the sound quality, speak more slowly and clearly. Perhaps its the different accents, but for example between 25 and 35 seconds, it wasn't clear at all. Maybe less speaking overall would be better, letting people read and think about things on the screen.
Also leave the picture that was on at 1 min 42s, on the screen for longer, so people have a chance to think about it and count the zeros.
Maybe include more about the definition of Planck length given near the top of this link https://en.wikipedia.org/wiki/Planck_length
All the best with it.