Looks pretty cool! One nitpick is, there are no markers/selection, so it's not very obvious that you can drag the objects, unless you stopped to read the descr

Looks pretty cool! One nitpick is, there are no markers/selection, so it's not very obvious that you can drag the objects, unless you stopped to read the description first. I'm also bit puzzled on how readjusting the object's position works. Usually, you'd define a pointer handler and transform based on the input, but if I understand correctly, the engine tries its best guess to automate this for you?