0101 "Release Rate Practice" - Just to prove a point, I solved this one without changing the release rate.
A time limit could avoid this.
0104 "Lost Exit" - The last part is a tad on the tricky side - obviously the exit is easy enough to spot, but having to turn around
and make sure no lemmings slip past the miner seems a bit excessive for a level at this point. I'd suggest reducing the save requirement a bit, or putting a wall on the other end so lemmings can't leave that area.
0105 "It's All Downhill From Here" - There's no reason this level needs to be this large.
0106 "Know Where To Bomb" - This one was quite a difficulty spike.
0107 "To Dig Or Not" - And this one even more so. O_O
0108 "Make Sure You Block" - Then, by comparison, this one is pretty easy. Also, this is another one that's way larger than it has any reason to be.
0109 "Building Test" - There's no way around it - this is an utterly
awful level. It's also yet another sudden difficulty spike, as any trick used to separate a worker using only builders will always be a fairly advanced trick. But the biggest issue is, once again, this level is ridiculously huge for no reason.
0110 "Treat Earth Well" - The crowd control on this level is nice, but I feel you could remove most of the building a path without this level being any worse off for it.
0111 "Cold Night" - This is fairly easy compared to the others as long as one knows the dig-under-blocker trick, but it's not a bad level otherwise.
0112 "Extremely Tough Level" - ...so, if you recognize it's extremely tough, why not move it to a later rank? It's not a terrible level, although it's a concept that almost every level designer has created some variation of.
0113 "Four Temples" - You could easily cut down on the number of builders in this level. Also, the third temple from the top seems utterly pointless - it's literally just "build up to the top of the wall".
0114 "Knots Landing" - Another long, easy level that's mostly building with a couple of other skills thrown in. From this point on, I will skip such levels, as they're just time consuming without offering any real challenge.
0115 "Blue Palace" - Okay, this one is a MUCH more interesting level! This one is really good - although I would say that it is another one that's a bit of a difficulty spike.
0116 "Pillars Of Earth" - Skipped.
0117 "Strange Place" - This is a pretty decent level! Although I think this might be a backroute.
0118 "Burst Pipe" - Skipped.
0119 "Very Dangerous Trail" - Skipped.
0120 "Search In Snow" - While I'm almost certain this was intended as another "use lots of builders" level, I solved it because I spotted a way to do so without using
any builders at all. However, even with this solution, this is still not a very good level - hidden exit (which is pointless in NeoLemmix, as clear physics mode can very quickly reveal it), and huge for no reason.