I wound up in this place, too. Which made subsequent levels really jarring, because perceptually they can be much farther away from exact and it'll snap them into place. I was actually quite enjoying the veeerrrryyy subtle tweaks to make the shape invisible. It feels like a game where the computer enforcing the rules actually harms the core experience- I imagine a game where there are many layers of tweakable colors in a big scene, and the goal is to make them all fade into each other. No "you did it, good job!" screen, just the infinitely subtle dance of dissolving shapes into color.