I dont want to be the one to cast the stone coz i definetely need to improve on mapping skills myself. But to release your first map, as is, may not have been the best idea. Although the theory behind the level has interesting aspects, I personally would have reconsidered releasing it as is.
A suggestion among many others:
Since it's really cramped in there, why not make it "q3 size" wider corridors, higher ceilings, etc. I requires q total rebuild, but envision it, maybe it would be worth exploring.
In fact, I recently found the .map of my very first lvl construction. ( A disaster and abuse of the "hollow" button) but I started fixing it. I am reconstructing from scratch revising all the major flaws. I am not sure it will be released, but maybe the revised version stands a chance. Yet to be seen.
No offence intended, just a share of my thoughts.