@Jeremy
Since you gave me permission from a while back to make changes to your pack as I see fit, I decided to take care of the conversion to NL for you. Here's your Blizzard of Lemm SuperLemmini levels converted to NL. I haven't confirmed it, but they should all open fine in the NL editor of either NL or SLX. Also, even though the conversion went without a hitch, you still want to check things like whether the terrain shifted over when it shouldn't, traps to make sure they function properly, etc. This is because conversions aren't perfect, so it's great practice to double-check everything after converting anyway.
I haven't decided what to do with your "Snow Palace" level yet. As I stated quite a while back, I can confirm that all of your levels are solvable on SuperLemmini except for said level I mentioned. There just isn't enough time, but I have confirmed that with an extra minute added so that you're given 11 minutes, the level becomes possible. If keeping the 10 minutes as the level currently gives, it would need maybe more diggers to make the level possible.