Fastest PS waves in the game, and not much mobs per wave.  Waves pick up speed from 26+

Not a great armor farm.  The tier 1.5 means rolls are slightly worse than tier 1, but better than tier 2.  Crystal cave is it's own category.

With the clouds and seed bomb towers, just have each one cover at least one avenue.

On the plus side you never have to worry about tower boost going down.  If you like the pets here, and end of map weapons, it's pretty quick to grab them all and try again.