"Just Fence!" - This one looks nice, but it more or less solves itself - "every time you have a fencer and run into an obstacle, fence it".
"Only Gliders Can Survive This" - While not very hard, this is a fairly nice puzzle. One thing I'll point out - you can actually make the pickup skill objects so that they give multiple skills in a single object, rather than placing the groups of 4 / 5 respectively.
"Tailor-Made For Stoners" - This is another one that solves itself.
"Now Use Swimmers And Jumpers" - Here too. Although I'm guessing by this point - your intent is to do tutorial levels for the new skills similar to Fun 1 - 7? If so, then in that sense, they work well - except that the Glider one, as well as using other new skills, is harder than tutorial levels should be.
"You need platformers this time" - This level I have to say doesn't really work either way. It's too complex for purely a new skill tutorial, but not really interesting as a puzzle.
"A task for stackers and climbers", "You need shimmiers this time" - Nothing much to say here. More fairly simple tutorial (I assume) levels.
"Not as difficult as it looks" - Okay, some aesthetic work is needed here! No reason not to resize the level so that the water / etc is touching the bottom edge - or move it downwards. However, as far as gameplay goes, this is actually a fairly good level - though quite a step up in difficulty from the previous ones.
"As long as you give your best" - This one was much easier than the previous one, but for an easy level, it wasn't bad.
"Laugh if you like lemmings" - Okay, a bit trickier again - and another fairly nice level.
"Keep your shoes on Mr Lemming" - I kind of feel this is one of those "everyone makes this sooner or later" puzzles. But it's certianly one of the less frustrating such designs.
"Impatience" - Heh, this is an interesting one because it's likely to catch out the
experienced players. I was looking at more complex solutions at first, before I spotted the simple one.
"We All Platform Across" - The abruptly-ending water looks really awkward - maybe place a block at the end of it? As far as the level itself goes, this feels similar to the early ones in that it mostly solves itself.
"Beginnings And Lemmings" - This was another more or less self-solving one - and not sure what the pickup skills at the end were for? Maybe I backrouted it?
"Don't let your heart deceive you" - This one was somewhat interesting, though it felt unnecesserially large.