Viewed all replays so far. "Skulls, Sludge and Steel" may be unintended since you have leftover skills and saved two extra lix; I don't know this level well enough to judge.
"Vignette" is unintended, which was very surprising since this level dates back to the Cheapo days, and this is the first alternative solution I've seen. Not going to remove this solution; it seems that the skillset necessarily allows it.
Everything else is either the intended solution, a slight variant, or the level has no specific solution.