So I give you points for creativity, because I'm not sure how you think of an idea like this. It's pretty easy to get yourself softlocked though, leaving you confused as to what your goal actually was.
I eventually managed to win, but only by discovering a bug: you can infinitely walljump, making it easier to stack blocks exactly as you want. Once I did that, I realized that I actually wanted to destroy the blocks I had previously placed, and that connecting all the like ones together would destroy them in a group.
So definitely some original ideas here, but definitely want to try communicating your goal to the player.