Haha, damn I got automated.
Cool idea with an actually real existing threat. I liked the step by step guide and how you also showed the next steps in this half-transparent sockets.
A minor thing: At the beginning i got a bit confused, how many objects i should place in one box, because label tells "objects" (plural), but at the beginning you actually need only one. But after bit trying around and when it later then also even needed different shapes, it was clear.
And found a little bug: Once i closed the box, but the white tape did not appear, so couldn't grab it and was stuck.
But all in all a great implementation of one actually simple game mechanic, with nice little animations (e.g. the closing of the box) and good looking environment. It's real fun :-)