This is most certainly the strangest level of all Wicked to me. I don't get the 37% rescue rate neither since you don't need to kill off that much Lemmings to beat this level. If they decided to only go with bombers, then the level would have been tough, although tedious.
You can easily save 100% of the Lemmings in the Windows 95 version by building over the top of the level, get all the Lemmings in one single enclosed space and start mining down to the exit. However, this tactic doesn't work in the DOS version, since the Lemmings automatically turn when they get too high on the screen, thus rendering the tactic of "going over the top" obsolete. If there's a way to save 100% in the DOS version, I don't know it.
Back on topic, here comes...
Wicked 7 - Last Lemming To Lemmingcentral
Good: A simple, short level that is pretty enjoyable to play.
Bad: Not very difficult. The puzzle's a simple matter of timing and it's not even tricky to pull off, actually. This level should have been placed in Crazy.