Awesomely cool idea! Love the art, the meta stuff, and Godot looks neat.
Couldn't finish it though, I tried dropping the mouse cursor on the X button at the starting area but it somehow doesn't work, and I couldn't locate any other X buttons. It's also possible to be stuck permanently if you drop back to the starting area unintentionally. One of my favs, and I love the mouse cursor constructing the level real time (wish there was more of that!)