Neat puzzle game. I do think the harder puzzles (9 & 10) have a bit of a "where do I even begin" vibe when you first open them, but you definitely start to feel the structure at least to some degree as you play them. That is, you start to discover more well-defined requirements than "somehow get all the stuff," e.g. on level 10 I eventually figured out I needed a route that let me go through at least some blue pipes, and that I therefore needed up to 2 blue lightnings.
I did have fun with the puzzles though. Solving them was quite satisfying.