The map started out incredibly strong. The amphitheater is a really cool concept and it looked great. I was impressed with how you maintained the smooth curvature and symmetry of it all. The area under the stage helped to sell the concept as well. I assume that those were dressing rooms that were locked at first.
The first area that you climb up as ogre grenades rain down upon you was such a neat mechanic. I'll never get tired of people using the high ground ogre in unique fashions such as this. Finally unlocking the main amphitheater area was a groundbreaking moment as you are presented with the scale of it as well as the grenade barrage. It was tricky at first but I learned to avoid too much trouble by constantly pushing forward.
I started to become a little disenchanted as I began scaling the audience balconies. Taking the elevator up sometimes put me face to face with an ogre - first a grenade to the face, then chainsawed to death as I had no way of getting past the ogre and no way to go back down. At this point, health and ammo were extremely scarce. I started save scumming in order to make it to the end and even then, it felt too rough. I started to flat out ignore the teleporting scrags and the final vore. On one hand, the final elevator up was interesting with more ogre grenades but if one made it inside the elevator, it was almost impossible to avoid the explosion. The shootable switch that closes the door only helps a tiny bit.
I did feel that the first half of the map was pretty perfect though. The ogre placement was spot on. They were exactly the proper distance to cause just enough trouble without feeling unfair. In the amphitheater, I would give the player a way to jump back down when taking the elevators up. Either that or make it so that the ogres are clear from the space immediately in front of the elevator.
Also please, please, please give ammo. I really don't even mind scarce health but if I don't have the ammo to kill monsters, then that's a huge problem. I never found a grenade launcher either so those basement zombies were just roaming around freely.
I have a demo but I don't think that it recorded much given that I had to reload saves a ton towards the end. I played on skill 2.
https://www.dropbox.com/s/dbwx9ek4gnmcn1k/amphichop.zip?dl=0
The non-gamma corrected version of the map won't load for me in Quakespasm. The version that I played looked fine. I think that the lighting was well done.