Time to say some issues about the map:
-Power ups spawn behind the barriers exactly, but I think this is a mojor problem, as I jump next to the power up to grab it.
-When I shoot zombies in their heads, their head doesn't simply get shot off, but the zombie dies with it's head in it's place.
-In this room that you create a challenge for a player to survive, you should've made it so that zombies inside the room only spawn power ups, and not outside the room, cause how is someone gonna get them.
If I find more issues, I will tell you. Overall I really like this map, and will play it again and again, especially on coop. I give this map 100/10 replayability