My biggest issue was confusion in terms of layout. You need to have more clear directions as to where RED needs to go right out of spawn. I couldn't actually see any signs to neither A nor B on RED, so I just headed in some random direction and I had to read the smaller signs on the walls to find my way. B also seemed hard to find for BLU, since it was inside, and didn't exactly attract any attention.
I was also quite annoyed with the small size of some doorways and most hallways. The insides of many buildings felt too small and confusing to navigate in the connectors between the points.
Oh, and the room where BLU starts is very cramped and can be really easily camped by RED. I suggest increasing the size of the room and making RED unable to walk up there.
You might also consider changing the RED spawn so they can't build indestructible teleporters.
I'd say something about cap times and all, but the teams were really badly balanced in terms of individual skill for the most part. All I noticed was that for a large portion of the time, both teams seemed to have the default spawn times. 10-20 sec spawntime for BLU is no fun.
Well, that's all I could think of, but don't worry, it's a very fun map with a solid layout overall.
EDIT: Oh, and attacking C was very difficult. BLU are kinda forced through a small bottleneck, while the point is right outside RED, with them having a big height advantage, which makes attacking a chore. The distance to the point from the entrances to the area, and the height advantage, should be similar for RED or BLU in my opinion.