Recommendation: "The Great Glass Elevator"
I did not see "The Great Glass Elevator" (by Bad Horse) posted to TWP, and did a Search but did not find it. Then again the TWP search function does not work well.
So I want to recommend it. I just happened upon it while perusing the Community offerings on Steam, and it was a blast.
Medium-plus difficulty with many rooms and vertical levels separated by glass . . . glass . . . and more glass. You will enjoy it I am sure.
http://steamcommunity.com/sharedfiles/filedetails/?id=73090593
Hmmm... looks interesting. Well noted 
I might give it a go later today.
useful tools and stuff here on TWP 
[spoiler]
[/spoiler]Hope you give it a try.
And - if you have time for a slightly wilder map by the same guy, you may want to try "Hard Eight" at http://steamcommunity.com/sharedfiles/filedetails/?id=75235455
There are a few gems hidden in the thousands of Community maps - LOL.
But still, I haven't found any up to par with Second Exodus, Changer 07, The Hard Way, etc
I am sure there are a few there but finding them is really hard to do. Like a needle in a haystack.