Thanks bossman!
Latching on at the sides was a pretty late addition but it opened up waaaay more puzzles, really happy I stumbled across it.
That's interesting about level 9! I think it asks you to compose like 3-4 ideas in a row, which is a much bigger ask than any of the others before it. Specifically, visualising a structure in one location that you have to build in another is a big step up.
It still takes me like 10 mins to solve the last level lol.