Use this space to ask questions or comment on the September 2015 GDS, "The only way out is up."
In particular, if you have any examples of vertical games beyond the two mentioned in the showdown description (Terror in Meeple City and Connect Four), please add them below with a link!
There are plenty of past examples. Here is the GDS topic with all of them sorted by month.
Vertical space will mean whatever the voters think it means, so you are all on the right track in that you're discussing it ahead of time.
Personally I would not include CamelUp as an example at all. Having a small stacking mechanic to determine order does not make "verticality" the focus of the game. Besides, the main playing surface is still a flat race track. No, nope, nuh-uh.
Jenga is a fine example. Hopefully we don't see half a dozen stacking games, though.