Spoiler grab hidden panel.
Congrats on getting 11 orbs. I still can't find all the places for bisscot tunnels or the forest.
Viewing post in The new BE Witches demo is out! comments
The rectangle under the ball can be removed right click and hold with pointing hand and it should lock on to it. Then move mouse around till the panel falls off. There's another slingshot there. There are several more panels like it on other floors. And that's not including the clouds and mini game switches elsewhere.