Look at them shimmy (Calm 18): Very nice level, but far harder than its position, because there are a lot of wrong approaches: Bash to the left and then platform to the left to free the right lemming. Or turning the wrong lemming into a climber. Or...
Pickup sticks (Calm 19): Excellent pick-up skill level


. But it uses a swimmer, before their intro level comes around...
A chillling breeze (Perky 2): Very nice level idea, but if one bashes one or two pixels too early, the lemming gets stoned too high.
Freeze Frame (Perky 7): Nice idea, but at first I wondered why no other lemming appears in the hatch and then feared that you set the number of lemming incorrectly and the level is impossible. Perhaps start the level at the bottom, so that the player sees the preplaced lemmings vanishing?
Express air-evator (Perky 8): Nice idea, but the digger position is rather precise. If one digs too early or too late the lemmings walk back towards the left again.
Two for the price of one (Perky 11): Good use of the radiation object, even though I only used one side of the level.
Gone for a dip (Perky 12): One of the harder Perky levels, because there are a lot of possibilities to contain the crowd, some only fail by a few frames.
To those who wait (Perky 13): I am not a fan of this one, as the solution is way too fiddly.
Don't get greedy (Perky 14): I got greedy and saved all lemmings.
If only they could dig (Twitchy 5): One has to be somewhat lucky, because on my first try noone entered the hatch. Only after I placed a blocker within the containment gap, I was able to succeed.
To each his own... (Twitchy 10): ...or all together in the same exit.
Do you feel a draft? (Twitchy 11): Amazing idea!
Operation: Super Rescue (Twitchy 18): Not my favorite, because the skills don't fit at their positions, which makes the level rather fiddly and unsatisfactory.
Dangit Harold (Hyper 1): If this is intended, then this is a rather huge trolling level.
The joke is on you (Hyper 2): Very nice level, that has a lot of possible approaches.
Thou dost ask too much! (Hyper 4): Excellent level!

United we stand (Hyper 5): One of the hardest levels in the pack.
Catch 22 (Hyper 6): I would like to have one more cloner. Currently using only two cloners to catch all four lemming paths is possible, but requires precision.
Diving for treasure (Hyper 7): ...and then being killed by hidden traps! Not nice.
Palace of winds (Hyper 10): Nice level, but getting a gap to the updrafts below the exit small enough, so that the gliders don't exit right away was the main problem.