1) Nice intro level and of the right difficulty.
2) I am not a fan of this one. The first digger has to be almost pixel-precise, because the ice acts as steel. Then one has to platform/stack over the decorative moon, where the contrast between bricks and the moon is very low, and finally one has to assign the last digger at the left edge, but not touching the steel blocks. As the lemmings in the right crowd are not grouped, this is very dependant on luck.
3) Next level with assignment-rage. At the start one has to assign lots of skills next to each other to different lemmings. With the L2 assignment, this is extremely hard. Again one has to assign a platformer over the moon, where one cannot really tell when the lemming has finished his previous platform. Finally I would give one more minute: After having "solved" the level for the first time, I forgot the lemming upstairs and turned him too late into a climber. So I had to do all these assignments again.
4) Excellent level.
But I would remove the iglu on the left side. At first I took this for another exit and moved all the lemmings to this one, only to wonder why they all die... And perhaps consider making the first miner block slightly smaller, because currently this level seems impossible if one has saved only 40 or 50 lemmings in the previous levels.
5) Pretty easy and nothing really special here.
6) Great idea.
7) Nice level. I suspect that my lower basher on the second block is not needed, because the delay of going all way to the left end of the level and back again is enough to finish the bridge over the second gap.
8) Great level idea, but sooooo much assignment-rage:
a) The platformers have to be placed at the very edge of the ice, because otherwise lemmings on the ice, who stand up will move left (on the latest platformer brick), then slide on the ice farther to the left, where they won't be able to reach the last platformer brick.
b) The timing at the top is very precise, because the digger has to be fast enough to stack at the next platform.
c) The placing of said digger is very precise: On the ledge won't work, because the digger will leave a ledge at the bottom of the digger tunnel and the crowd will move over the stacker wall. Too far to the right and the crwod will be too early and there won't be enough space to place the digger on the next platform between the ice and the stacker wall.
d) At the second platform digging down is very precise: First of all one has to place it in the small space between the ice and the stacker wall, and secondly one has to time it so that the non-platforming ice-skater will move to the left at the bottom of the digger tunnel. Alternatively one has to turn this ice-skater into a digger, but assigning to it in the crowd of usual lemmings again depends on being very lucky.
e) At the third platform, a crowd of lemmings will move to the left and here one has to assign the ice-skater.
f) Finally at the bottom, one has to turn a lemming with a stacker-skier combination. This is fine, but then turning the skier into a platformer at the edge of the ice is very annoying. Especially as this has to be done pixel-precise, see a).
9) Pretty easy.
10) Nice level, but again pretty easy.