Satan 1 -
All For One Really nice bombers only puzzle here!

You really need to think about who to bomb and who to let through and how to bomb. In particular, I especially love the part where you need to bomb a faller to release others to do some of the path, that was a stroke of genius

Well done here, WillLem.
Satan 2 -
Rebel Without A Claus Looks like I share Apjjm's feelings about this level, as this too was a favorite of mine! Very nice puzzle involving figuring out how to save the swimmer/glider before he gets into trouble with the firebox, meaning you need to prepare the route with a normal lemming before that happens. I do have a spare builder, though

Satan 3 -
Marshmallow Land II I consider this level a huge step up in difficulty. Although it seems that you have plenty, the skillset in actuality turns out to be very limited and tight. The cloners do help to overcome some of the shortcomings, but you still have to really think about how to go about the level. I should had realized sooner that the way to get to the exit is through the cat face, as building all the way across the water uses more constructive skills than you're given. It's a nice puzzle if my solution is even the least bit intended, but yea, this was a hard one to play and figure out.
Satan 4 -
Mary Christmas Nice remake of "Take a Running Jump..." from the OL, as well as using a part of "Mary Poppins' Land" design. This one was harder than I thought it would be, although it's certainly due to the very limited amount of builders. As a matter of fact, you're given the bare amount needed to solve the level. It took me a while to figure out where to place the first builder in order to make a splatform for the crowd with the "Mary Poppins' Land" structure. Here, I would reduce the precision, as it's still not very clear that the drop is safe with 4 builders. This is just me personally, though. However, I think it's exactly the way the structure is made in that level.
Satan 5 -
The North Pole I was a dummy here for quite a while, as for some reason it didn't occur to me to make both preplaced lemmings go out to the right rather than one each in separate directions. You certainly won't have the necessary skills to make either the floater or glider turn back towards the exit if they fall out to the left. A little bit too tall IMO, although I certainly understand it's supposed to represent the actual physical distance to the North Pole. Also, I wonder how long it took for you to figure out where to put the stars so that the gliders continuously bounce back and forth without leaving out the right side of the level. Nice touch with saving the climber/glider hatch by destroying some terrain on the right side

Satan 6 -
Icy What You Did There Somewhat challenging, although the level pretty much solves itself as long as you make sure to build on top of the inclines and simply platform along the bottom of the platforms and then bash once the gaps are sealed off so that you have the right distribution of lemmings going for the limited exits. This was quite a nice puzzle!
Satan 7 -
Merry Christmas M. C. Escher Harder than I thought it would be, especially with figuring out how to manage both the normal lemming and neutral crowds and ensuring no one slips past the teleporters on the extreme edges on either side. I wonder if my solution is a bit of a backroute due to how I used a stacker to prevent anyone from using the bottom teleporter and to pretty much turn everyone back towards the left exit

Satan 8 -
...And A Happy New Year! Much harder repeat of Santa 1 due to a far more restricted skillset. A very fine puzzle here where it's very non-trivial to figure out the best and most efficient route. I think it's especially fun with X-of-everything levels and to see how much further the skillset can be reduced in the repeat and still be solvable. It definitely seems that 3 is the absolute minimum in this case, as I'm almost certain that a solution is completely out of reach with a 2-of-everything skillset.
Satan 9 -
We All Fall Down Another repeat, except you only have builders and bashers. The solution is pretty obvious, just getting it to work and executing it can be hard.I likely could had saved up some builders maybe if I had built along the starting platform at a later time.
Satan 10 -
The Icicle Lane Looks difficult, but it's really not thanks to the very low RR. It's more than enough time to seal off the gaps before anyone falls into oblivion, especially among 3 hatches. I spared a builder and a basher here

Satan 11 -
Escape From CindyLand Another repeat of the CindyLand level from the previous rank, except the hatches and exit are in different locations, and the skillset is different, with a far more limited builder supply. In turn, the amounts of the other skills have increased, and you also get an extra 2 minutes. Once again, a huge builderfest and one in which I probably could had saved far more time had I done a bit more multitasking than is shown in the LP. It's certainly a good lesson in being economical with your builders, saving them wherever possible. Originally, I wanted to get the right entrance out without needing to send someone from the left entrance over via interrupting bashers/miners midstroke with a builder, but I think I would had maybe ran out of builders that way. Instead, one could send a lemming from the left entrance and use a digger/basher staircase.
Satan 12 -
Running Home From Christmas Really nice and fun open-ended level to finish off the rank. Definitely reminds me of "Rendezvous at the Mountain" in that there's one entrance on each side and the exit is in about the middle. That reminds me, didn't Lemminas finish off with a similar level type to Mayhem 30? Except there's a lot of different choices of pickups to go for. Very easy to go for a save all here. Multi-tasking might not even be needed at all given the high time limit, although I didn't want to take the risk