On a funny note, Spiff (Ultimortal) kept releasing updates well after the first official release because people kept finding alternate solutions, and he was so strict about having just one per level.
I beat the Electric level by pulling off an insane move: jump from top to bottom, grab a piece along the way, place it before you land. It shocked him and he promptly edited the level to prevent it.
And the level in the screenshots, Vertigo, was the hardest and most satisfying solve for me, then it turned out somebody beat it with blocks left over.
By the way, Ultimortal's IJI was released a couple weeks ago. It was started over 4 years ago and some early demos were posted here.
Yeah I remember him posting those demos, really good fun game
Indeed, it's exceeded all expectations, even those of the playtesters. Well worth the download. For more info I wrote a Promotional Preview.......
here.