The map idea and name come from making a KFO map where the player gets to choose in game how long to make the game or infinite. Thus the "Options" to "Progress"...
from that though it got out of hand with all the wordplay and jokes. I first decided to add Prog. music album covers.. the broad way I defined Prog. music is debatable though so I guess it is best to look at it as "interesting artwork" rather than pure Progressive music albums... just the way the ideas evolved really...
At the last, while I was trying to decide what image to use to "brand" the map, I found the joking HR Dept I created made another "Progressive" joke .. so I went with it.

The KFO map I will be working on after another map. The KFO will expand two more floors where the Patriarch and infinite waves will take place on the roof of the building. The first floor is entry, second offices, third will be a zed production floor and the roof will be zed testing / battle ground area. Please look forward to it.