Okay, watched your solutions. Some comments:
Outbreak 3: That has to be the tidiest "100%" solution I've seen yet.

Outbreak 4: That's also a new way of solving it, and the first right-side solution I've seen (though of course I knew it was
possible 
).
Plauge 1: That's the first time I've seen anyone else pull off "100%" on this level, and like with Outbreak 3, your approach is far tidier than mine.

Plague 5: This is a third way of executing the solution to this level. Nice! It's still very close to the intended solution so I wouldn't call it a backroute; just an alternative.
Apocalypse 1: Your replay doesn't seem to work. It just assigns one lemming a climber who walks into the trap, then nothing else happens. (Maybe it's from the pre-update version? The new version has one less zombie, which somewhat messes up existing replays.)
Apocalypse 2: Congrats on a new saved lemmings record!

Apocalypse 3: Not the intended solution, but I like that one so if I can fix Akseli's backroute without breaking yours (which should be doable), I'm leaving it in.
Apocalypse 4: Backroute; it's similar to Akseli's one. It's gonna get patched.

Apocalypse 5: Backroute; undecided as to whether I'll fix this one.