Thank you.
Well, I think some look ok, but some are pretty ugly, like the second or the fourth one.
Another bad thing about my level is, as you apparently have already encountered, that the solutions are often very difficult to execute.
I strongly recommend you to use Lemmix to play these levels as this allows you to make savestates so you don't have to waste your time playing the level over and over again and can concentrate on finding the solutions instead.
Please note that "Mission at max-fall 60" is to be solved with max-safe fall distance of 60+3 (like in original Lemmings or CustLem2), and cannot be solved in Lemmix.