I played this yesterday, in general I really liked it. The flood and human traits are balanced, the weapons and ammo on the map are well laid out, it looks really good aesthetically and it feels like a favela. I love the close combat gameplay and how, especially on the first staircase, they drop down on you, get killed, then almost instantly respawn ready to drop again.
But I have to say that at times it really isn't obvious where to go. It's fine up until after the first phase, where the humans jump onto rooftops. They are led right up to the top of the map and are then expected to jump down to the bottom of the map in the next phase. This is counter-intuitive and most of the players just stayed up there or got confused and ended up jumping onto other rooftops which had soft kills on them. Essentially the problem was that you have bounded the edges of the map with loads of soft kill zones instead of visible barriers. I'm assuming this is because the map looks nicer without high walls everywhere, but some players got really frustrated from moving into soft kills and not being able to figure out which direction they had to move to get back out of them, especially as the flood.
One last thing is that, with the concrete door in phase 2, about 4 of us smashed it down then one person got stuck inside (where there is another soft kill) because the 3 of us were trying to pile in, thinking it was the way forward to the next phase. He couldn't get back out and died from the killzone.
. Second I am glad you brought this to halo 4 because it was one of my favorite maps in Halo Reach. Hope it plays the same.
