Eon 2 Trust Your Lucky Star : changed the vertical structure again, talisman was too easy.
Eon 5 Four Shruggers : worked on the chains to prevent easy ways in them. Beware if you're used to them : Oh No Brick chains do not react as usual.
One 3 Clappy Clapple : tightened things and removed a builder. This breaks the second solution with compression offered by Armani some posts upper. It was cool, but involved the pionneer to go in by himself, and I think interaction is always better.
One 5 Blues : blocked Armani's last backroute to the exit. I must say his solution was very tricky indeed but I fear it may save more than one. Can you find intended ? Easier to execute I think, lems control required.

One 5 Blues : Using nuke seems mandatory indeed because not enough destructive skills. Your solution with flooding a chain then nuke and block near the exit does work, though it could certainly save more than one with a little tweaking and luck.
Maybe I'll work a little more on that, but the number of ways to reach the exit is so big that I'm scared I cannot counter them all.

Intended solution uses the whole level, and control the lemmings so that it is quite impossible to miss the nuke part.

Eon2, Eon5 - look intended for me now
Neo1 - probably intended? since you said the intended solution is counter intuitive and I made the turn-around point farther and save more time as a result.
One2 - looks intended
One5 - another nuke solution.. I'm pretty sure the intended solution has some kind of nuke interaction in it to compensate the lack of destructive skills, but I'm not sure if this is the one you intended.