That's a so clever concept! Presented in a really funny way!
My first thought when seeing the last was that there was no way I would complete that. Buuuut... I eventually made it. x) It was laborious, with methods implying a lot of precautions. That might be the only downside: at some point, it's less about solving the puzzle and more about being patient. But that's inherent to the concept, in a way. I like how the system stay true to its core, and presents a logic easily understandable. It's elegant, and fun!