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I'm glad Pieuw agreed. Has he said anything about what to do with levels that don't work in part or whole?

I'm afraid many levels will give you trouble, as I had fun exploiting a lot of Lemmini's weird mechanics... you can do what you think is best, I give you carte blanche. Open source PimoLems!

Jeez, everybody is posting so quickly on everything lately... I can't keep up

If you want to do it, sure! by all means. I really don't have a lot of time atm, but I could do a few things, you can ask me about whatever.  I do remember backrouting a few of Pieuw's levels, I'll see if I can find old replays or just remember the levels.

I'm glad Pieuw agreed. Has he said anything about what to do with levels that don't work in part or whole?
Some levels may just need a quick and simple fix that wouldn't even be very noticable; while others may require more serious changes. Some levels might still be possible but the exact solution may not be at all possible.

Some of the major issues I can think of off the top of my head:
-timed bombers
-the timer of Lemmini is tighter
-miner's don't turn on steel
-splatters can explode
-direct drop does not work
-while I don't think Pieuw or Dodochacalo ever did this, Gronkling definitely has; look out for entrances with terrain behind them to turn the lemmings.

A closer attempt on IchoTolot's level.

Spoiler (click to show/hide)

It still falls one Platformer short of actually succeeding, due to those damn traps near one of the exits (didn't notice them before).

I've also found several other things that almost work. For example, one thing I tried is having the Glider (rather than the swimmer) cover the water just before the area where the lemmings split up again. With good timing, it's possible to ALMOST set it up so that no extra delay is needed, and the climber can create the landing platform for him. However, this fails by a matter of a few frames. In my opinion, while it's hard to avoid having one or two things that almost work but don't quite; this level has a lot of such scenarios, and this is really detrimental to its value as a contest level IMO.

Spoiler (click to show/hide)

I think you can see where this attemt went wrong horribly and I thought the little 3 podests were enough hint where to put a particular skill
I did not consider all the delaying things and scenarios you tried (I just made sure there is no other way than the intended) and even thought they could be helpful in any way, cause there is a very simple solving way where you just use the individual strenght of every single Lemming (so they are in "Unison") so you just have to follow the levels flow.

My thoughts:

IchoTolot's Lemmings in Unison (click to show/hide)

Ooh, don't even know where to start on this one. A big downside I see here is that it's very hard to tell what is and isn't steel in this graphic set; this probably works well in L3 where it's specifically that game's workings, and you get used to it playing that; but for L1-type levels it's somewhat of a disadvantage. I will come back to this one later, though!