of course i solved all of the puzzles myself before uploading it. i can send you the solutions ;)

Yes you should but

I mean did you tick all the necessary tools to finish this level? Looks like portals are needed but not available to use.

EDIT: Nevermind, my brain stopped functioning. Of course portals are not needed.

you mean i should add a really evil portal map?

Did you forget to add portals as available tools?

Also, I think in general it would be a good thing that the authors have to solve a map before publishing it to the workshop.

Well for #1 it's a bit difficult to see the solution but I think most who did the lab map will find it. thought about making a map with only a gimmick solution and having some random doors / platform just to distract people.
#2 seems to me pretty straight forward and not too difficult.
#3 while the tick count is low it doesn't require a full optimized solution. reducing the tick count to the possisble minimum would be way more difficult (on all maps)
#4 should be also not too difficult when you look at it and think about what has to be done.
#5 adding more blocks is possible to make it more difficult. you don't have to cross the ways too often.
#6 is for sure not easy. the thing you really need to be aware of is how to waste 1 tick for the yellow push.

If you would make a version that all arrows vanish after a fail attempt it would be way more difficult ;) but not sure you want to do that with maps that have ~30 arrows.

I can't finish any of the 6. Truly epic level design.

Do you think it's possible to make even harder ones, or did you optimize the amount of evil?