[Ideas] For my next level...
Well... the last reply is a little while ago, but I just found this thread minutes ago.
Are people still looking for more Portal 2 Tower Defense Maps?
I know most people did like the 2nd one very much, but what should a new map include?
Back in 2011 and early 2012 I was thinking of a 3rd Tower Defense Map, but never started
to work on it, because I pretty much used all my ideas in the 2nd map, already... 
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Brainstorming right now:
- bigger Map, where you actually would have to use your portalgun to move around
- not only one control platform for each player, but many of them around a big map
- no random path of the cubes, but increased difficulty with larger amount of them
- I could work out a way to make the map with two or more floors
- maybe a certain amount of companion cubes to activate some things
(so you would have to pick some stuff and cant use all stuff at the same time)
- more combo-triggers where both players have to press a button to activate a
big ass combo-cube-killer-thingy... whatever ^^
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Well... I am not sure how this all would work out, but probably worth a try.
Do you you have more suggestions?
You could try doing something competitive. Like one person controls the attacking force and the other is defending.