Yeah I was debating whether I should spell out the piece interlocking mechanics at the start... but I ran out of time to add any kind of proper instructions for them, so that made the choice easier haha
Like you said, the interlocking stuff is really the core of the game. That actually came about because of the "reassembly" theme. There needed to be a way to detach parts from each other, and I didn't want to add some kind of complicated glue/welding mechanic.