Outbreak 5: I wouldn't call it a backroute - the most significant trick is still there. Still, you found something I overlooked, and as such managed to break my record for saved lemmings.

Plague 2: While technically this one does require precision... the level design already times most of it for you.
Plague 4: It looks like you overlooked that you have Walkers in this one...

Plague 5: Now, the reason I put this one at the end is that unlike Plague 2, it doesn't time itself. Maybe it's easier than I thought, but IMO the timing could be quite tricky on this one.
Apocalypse 1: Eek. I didn't think it'd be possible to sneak enough of the crowd past the first trap like that. Looks like I might have to bump up the save requirement a bit... either that or make the crowd less compacted.