I enjoyed this; I didn't hit upon the pattern for solving the puzzle, but with the help of my pencil and paper I did manage to finish without running into any dead ends! Which was a relief given that the fate of the entire world was resting on me 😄
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Impressive job staying with things and forging through! Problems like this can be really tough if you don't see the insight bit. (The problem is, now I've seen/worked through it, I forgot what it was like not to.)
Your comment makes me wish I'd printed out how people got through at the end, so they could compare it with the solution given in the walkthrough.