Level 2 is excellent, sort of a combination of a couple tricks from other levels, done rather well. Level 4 is, clearly, the original version of Level 2 in his Cheapo pack, although the terrain is slightly different.
I've just alllllmost passed level 5, but I was one pixel off at the very last step... unghhh! It will probably take me another half hour to get to that point again! (Edit: OK, it didn't
Nice twist by the way, even if it is annoying to pull off...)
And I think a clarification is needed for Level 9. The max safe fall distance is 66 in CustLemm, but 63 in Lemmings and CustLem2 (I know, the number is 60, but then you add 3 from the transition to faller). So it's meant to be played in CustLem2?