Played co-op by myself with 3 bots.

The bots did not pick up the defib at the ammo pile in the room with the bridge switch and kept going back into the water even after I had crossed the bridge that I let out, but they did catch up once I went down the passage after the bridge. I don't usually care about bot behavior because I consider L4D2 a co-op game, but thought you might be interested in the info.

Played through first map and when it tried to load in next map, it failed to continue. I know there were errors in the console when this happened but forgot to copy them. I'll try again soon.

The first area outside with the cars does not "feel right". I think it might be that the cars all feel too similar looking.

The first alarm section where you must find the open door was not too difficult to figure out (others had commented about this), so I think it's fine to leave in.

After going back into water after making bridge come out, there was a witch sitting in the water near the ladder to get up to the bridge. Assuming the witch was intentionally placed there by the map (because she was not there when passing through that area to get to the bridge switch), then this seems outside what is appropriate because there was no way to see her, even by ducking into the water. Just seems a bit unfair due to the constraints of the game and the (lack of) visibility of the water's top.

The place in subway where it's well lit and has red and white tiles seems oddly "undisturbed". Of note, the 4 subway cars blocking the rail line passages all seem "too perfectly positioned". Maybe there is in-story reason for this, but I did not discern what that was.

I liked the use of blocked caved-in passages and the subway car hanging through a hole in the ceiling.

The general flow of the map seemed to work and even in the water area where I had to press switch to let bridge out was not too confusing.