Thanks for the update and all the additions and improvements you've made!
The new pickup skill designs are awesome, though as namida said these will no longer work once the new NeoLemmix format comes out.
Biolab:
Love the trampoline-esque antisplat pad. A splat pad should also be included.
I'm not sure if it was a good idea to shrink the brown tubes. Please bring the big brown tubes back; I preferred those over the smaller ones.
Circus:
Thanks for turning the silver columns to steel!
This one should also have splat/antisplat pads, and a similar design to the antisplat pad used in Biolab will also be perfect for this one.
Cyberspace:
I don't like the flashing on the antisplat pad; again, it would hurt one's eyes. I would remove the flashing. I would also include a splat pad.
Snow:
The new cave background looks quite awesome and feels reminiscent of Ice Cap Zone.
I didn't like it at first, but now it's growing on me; it's definitely a lot better than the squares one. Thanks for adding the snowflakes as well, though I think they could use a little animation (like how LPIV Space's moving background stars are animated)
Toys:
Love the clouds you've added; it makes the tileset so reminiscent of Toy Story
!
The steel beams IMO are hard to work with if one wants to use them to patch some backroutes. I would also include a 16x16 steel block.