Right now the basic observation seems to be that a tray, or group of trays, result in the horizontal construction of a floor of related levels. I'd like to see this changed to vertical construction of related levels.

With specialized gear, it makes sense to try to attack specialized levels. For example, you might want to attack all four slumber cradle levels in order. Or, you might go for jelly farm 1 and then jelly farm 2.

Right now you can't. The levels group horizontally, and the elevators will not take you horizontally.

Vertical building, combined with the "wait at the elevator for the floor you want" can turn into a "Choose your path" adventure, and give people a reason for experimenting with different builds for different types of adventures.

Equally, if you expect people on a jelly-based level below depth 12 to have a good set of jelly equipment, you can make it a little harder than it would otherwise be. This gives a little more flexibility in making balanced yet nasty encounters.