Here's some feedback from the first rank, bearing in mind that I'm very much an intermediate solver. Hope it's useful:
PicnicLevel 6
Play Bridge: I like this level as it was originally - you can avoid it being a builder-fest by using the two blocks either side of the entrance as "blockers" (by having the first few lemmings build up to them) - this works best when the lemmings are coming out in both directions, as per the original level (N.B. My replay reflects this; I put the left-facing entrance back in to the level).
Level 7
Ups and Downs: Possibly a bit too difficult for the first rank as it requires keeping track of several miners at once across a large landscape. A good level though.
Level 10
Arrow keys will help you here!: Good level, but I solved it using mainly diggers and builders, which I feel misses the point slightly. I've attached an alternative version of this level which preserves its design but amplifies the point of it being an arrow-key exercise.
Level 25
Song of the Lemming: It's a beautiful looking level, seems a shame to get rid of it. I've attached a quick re-design to make it a bit more of a challenge but hopefully still in line with the other levels in this rank difficulty-wise - feel free to make any further necessary tweaks if the final decision is to keep this level in the pack.
Level 30
The Shaft: To be fair, this is a relatively easy solve once you realise that
, managed to get 100%! For that reason, I'm undecided as to whether I'd vote to keep it in this rank or move it up. See what others say...
Level 16
Eeeny, meeny, miney...OH!: I think this level is super! It's a welcome little change from the preceding levels, with its single lemming and generally different sort of puzzle than just terrain building/destruction. Well worth keeping, IMHO.

Levels 11, 15, 20, 23, -
Through Fire And Flames,
Gotta Save 'em all,
Not a basher tutorial,
Stranded- These levels are my favourites, and could be viewed as the difficulty standard for this first rank. Nice and easy but still require a bit of thinking through.
Overall, really enjoyed these. They're are the the kind of playable levels I'm hoping to get good at making.
