Really neat idea! I got stuck at the puzzle where you have to activate a button on the ceiling that's just past a barrier... I wanted to make a ramp-thing and launch an object into it, but it was cumbersome to try something and then have to restart from the checkpoint and get back to the room to try something else, so I ended up quitting.
But the amount I experienced was really pleasant! I especially loved the puzzle where the button was on the ceiling, and I drew something that hooked onto both the circle in the room *and* the ceiling the button was attached to to keep it pressed while also ensuring the drawn object didn't fall.