Excellent, thank you for this development process! Indeed, my version was done very quickly, so all the polishing work was left undone.
You are right, in my video I didn’t show the properties of the shape painter, it’s crucial that “Draw the shapes relative to the objet position on the scene” is unchecked.
If you have time and energy to create the more advanced exaple, then please do! 
Crediting is nice but not definitely not oblicatory, I just gave the first idea of how it could be done. It’s enough for me that I have possibility to help the GDevelop community. 