I updated NepsterLems, so that it stays solvable in new NeoLemmix versions (at least with high probability). This meant removing the deadly sides gimmick from all levels, which may or may not have introduced new backroutes in some levels when played with V1.43.
Apart from that I did fix a lot of IchoTolot's backroutes:
3-16, 4-7, 4-8, 4-9,5-7, 5-8, 5-11, 5-12, 5-16, 5-18, 5-19, 6-2, 6-3, 6-4, 6-5, 6-7, 6-8, 6-9, 6-11, 6-12, 6-13, 6-16, 6-17, 6-18, 6-19, 6-20
In addition to that, I replaced 4-15 by a completely new level. The old level had un-fixable backroutes and with the oncoming physics changes a few more easy backroutes will become possible. So a level from "Return of the Tribes" got moved here.
The following levels were solved by IchoTolot in a non-intended way, but the solutions were comparable in difficulty and beauty to the intended solutions, so they will stay:
4-10, 4-11, 4-13, 4-18, 5-4, 5-13, 5-14, 5-15, 6-6, 6-15.