Well, I did pretty much nothing on these since the last post, and I'm not envisioning much progress in the immediate future, so I'll just post it as it is now. The attached file contains 94 levels.
Added levels since last release:
Flower: Big & Small, Bucket List
Humane: Interval Training
Arcane: Urban Ledge-end, Shopping Cart Race, Lord of the Rungs
Insane: Made to (mis)measure, The Dugout
Flingsane: Coming Unstuck, Another Pick in the Wall, Extension Cord
Changes to existing levels:
Abridged Version - moved the tree left to make it more useful
The Turnaround Compendium - added sloped terrain at the bottom, needed due to diggers not turning on steel any more
The Endless Steps - added 10 bombers, added diagonal blocks in the middle to reduce the number of bombers needed
Throw The Switch MkII - replaced the saw trap with a holding pit, added a saw to prevent another backroute
The Pits - renamed to Underbelly
Catch Your Death - left wall moved across, one jumper removed
Hidden Springs - added jumpers, which may help depending how you try to do the level
Flotilla - spaced out the level more to make execution easier
Sand Me Down - replaced non-free trees with umbrellas (the palm tree graphic was found on the web, and thus may not be public domain and shouldn't be used)
Crevasse - slowed SI from 60 to 70
Square Squabble - reverted to a single entrance, slowed SI from 20 to 40 (hoping this doesn't cause problems, I forget the exact reason for the dual-entrance setup I had before)
From the Brink - added more space at the top to aid execution
+ other purely aesthetic changes on some levels
Needs decoration: Run around the block, Urban Ledge-end, Tribute to Sliding, Lord of the Rungs
Other notes: Added level ordering text files, some minor changes to level order, plus a description text file (text displays in-game when you navigate to levels/single/clam/).