Reminds me a little of radial menus (https://en.wikipedia.org/wiki/Pie_menu). They don't handle dynamic context menu contents well but they're amazingly efficient.
> Interacting is even faster since Kera Desktop features “press and hold, move and release” gestured menus. Saved you a click!
Note that you can also use right-click menus this way on macOS and GNOME. That is, you mouse down, drag your cursor to the item, and mouse up to select it. The only downside is that if you regularly use Windows it's annoying to unlearn this behavior.