In the meantime, here are my current solutions to a load of miscellaneous level.  Some look like backroutes.

11th sounds good to me for now.

I've got a question: once the Playing Phase starts and therefore levels are made public, could I immediately put the level (still "in" the Contest) in a level pack (though I may not necessarily make it with the level pack before the Contest is over - so I'm not saying I'll do it, just asking what the rule is)?

Unless something unpredictable comes up, I should be able to make it at any of aforementioned dates and times.

The original proposal (ie: entire lemming is grey, different shades for different parts of the lemming) or Crane's (ie: lemming's clothes are grey, but hair etc remain normal color)?

I'd prefer them to only have grey dungarees, grey skin evokes associations with zombies or such for me.

I second this notion, I in fact found myself quite often expecting the Lemming count to turn red or flash in such cases.

Crane, IchoTolot, Minim, Armani - all of you have done well with with achieving intended solutions to my levels (CAUTION Open Pit is a fairly open-ended level anyway, excuse the pun). Good work and thanks for checking them out!

I'd like to attach my replays to this very post here as well.
While I'm at it, it does seem like I've solved Highland Fling with exactly 5 builders (prior to me even reading about your challenge), yayz

So I finally got round to watching SQron's replays. Very nice Again there were some interesting solutions that were new to me, particularly on "Let's get together", "Down the tube", "Lemming about town" and "Scaling the Heights". You found the same backroute as joshescue on "Oh No! Squish", and two new backroutes, on "No world without you" and "Electric circuit" (fortunately these two will be very easy to fix).

So, a little bit of clean-up needs doing before I'm ready to move this to new-formats, but it should be coming soon now

Thanks! I can't recall whether the solution to "Let's get together" is mine, partly mine (continuing from a looked-up solution) or looked-up/some one else's solution - I was really curious about the solution to that level.
I have to admit I was really pleased with myself about that "No world without you" backroute, hah!