I've played through your new update for Warm, here's some things I noticed:
- In the floater tutorial level, you could probably benefit from making the lemmings come out of the entrance facing left. All you have to do is click the "Left-Facing" box on the piece properties in the editor.
- The bomber tutorial level still has the blockers, not sure if this is intentional. Also, it's missing the decorative arrow on top of the exit.
- The way I solved level 10 could be useful for a repeat version of this level (if you're planning on having repeats).
- Level 18... just for the record, this trick has really been done to death by now... (see: "I am A.T." in the Genesis version, "Wall of Wisdom" in LPI, and countless others). Ignoring that, I'd say this trick is also too obscure for a first-rank level, even with a level like this that makes it fairly obvious what to do. And ignoring all of those; there's a backroute here, unless you intended for what I did to be possible...
- Level 24... hmm... I can't help but notice that the name is the same as one of the LPI levels, which also involves getting past steel in a similar method...
- Level 25, again, the exit is missing the decoration (the flag in this case); though with the Snow set this isn't so noticable.
- Level 26, that's three levels by this point focused solely on blocking... :/
- Level 27, very nice concept, but the way the one-ways just cut off at the bottom-right is a bit untidy. If you weren't aware, in NeoLemmix you can make one-way walls only apply to certain terrain pieces, so that they neatly appear on the rock piece but not the pole (or all the way down the pole, if you cover it with another one). When you use this option, it doesn't (yet) appear properly in the editor, but when you play the level you'll see it.
- Level 29, just my two cents, but I'd recommend stick to one version of the style instead of using the DOS one in some levels and the Genesis one in others. On NeoLemmix, their trigger areas are the same, if that's what was the motivation for using the other one.
Now overall, I think these are some very nice levels! They're all quite simple (apart from Level 20, which could be tricky for a new player), but they're mostly fun to play and are very nice-looking. I look forward to seeing the rest of the pack, especially once it gets harder.
I've PM'd you my solutions. Note that I played all the levels again, so even for levels that I sent you solutions before, I've probably solved at least some of them differently this time.