I used to play a game called "There is no game: Wrong Dimension".

There is a scene which has a progressBar but the progressBar works with gravity (yeah thats true.). The cut was like this below.

https://youtu.be/0dZSZppXN-4?t=690

This site is a showncase that worked like this.

https://gravity-progressbar.vercel.app/

https://codepen.io/MoYoez/pen/GgqzNoG

MIT