Quite a few improvements picked up by the community last night and this morning. (Thanks for your contributions) I optimised a couple more levels. Also, the Gentle 1 reads "0:17.82" as the result, despite being written as "17.18". Still, I hope everything has been recorded accurately. I refreshed the zip file.
My improvementsLunatic 21: Improved to
1:54.18 thanks to Proxima's "Crankshaft Bomber" technique (I must keep a record of these techniques sooner rather than later). Still needs optimising for crowd release rate adjustments and narrower gap between builders. Also may need to look at holding the pack with builders if the trap builder somehow becomes an issue.
Manic 31: Improved to
0:47.18 because I took the lower "Vines" route rather than the higher "Gem & Steel" route.
Zany 4: is now
1:24.06, a minor improvement to WillLem's solution, but that digger wasn't needed at the end because he had 1 lemming available to lose.