Yeah, it's poorly-implemented. The first real spot in the game where I thought the guy needed someone else looking over his shoulder, or more playtesters. That fucking lip on the ceiling creates all these logistical problems for no real gameplay benefit, and the yellow cubes just don't move the way you expect unless it's in a straight line. I got all the way to the top, hit the lip, and couldn't progress at all without removing my bridge, had to restart

Still, it was tense for that reason. Sweaty palms for sure.
Since you already know what you have to do, I may as well give a few tips 'cause the actual implementation of the strategy is so tedious and it would be a pain to have to repeat it -
The way to do it is to get past the initial cube at the bottom by avoiding the sides, then hugging the sides all the way up. It takes like a solid 5 minutes but there is basically no way you can fuck it up if you just go in a straight line all around the sides of the cube. You do have watch out for the lip near the top though, and start making diagonals instead.
And there is bad news waiting at the top. But good news soon after that
