Before I make an adjustment, I am curious what you think of this one. It is in the "Extra" pack, "Sega" level 10. It is called "Stepping Stones".
It is a variant of Mayhem level 21 "With a twist of lemming please".
The entrance is too high and the lemmings splat when they hit the ground. Mayhem 21 has enough floaters to save them all, but Sega 10 just offers 2 floater skills. It also has 20 total lemmings and you have to bring 85% to the goal, so only three are allowed to splat.
I guess you are supposed to float a couple of lemmings at the start and quickly get steps built so that the remaining ones won't splat. I haven't found a way to do it with less than 4 splatting. One set of steps is not enough, you need to build two and it takes too long.
The SMS version which this level is based on is set up in such a way that you can keep lemmings from splatting with just one builder skill. Float the first lemming, have him build right to left, float the second one, and then the rest will fall safely. This doesn't work in the Lemmix Player version.
https://www.youtube.com/watch?v=GiyKNaEcf5o(Just looking at the first ≈35 seconds here, I haven't even thought about the rest of the level yet.)
As such I feel that an adjustment to this level is needed so that the original SMS strategy will work. The simplest thing seems to be to lower the entrance by a few pixels.