Just played it for game day and wanted to share my thoughts.
The balance seems a little bit weird, though I think part of that may be because of the spawn stuff mentioned during the game. It seemed like it is a map that once BLU got rolling it is pretty hard to stop, and if blu ever dropped the ball it was pretty damn hard to pick it up again, like in the last game.
Here, one thing to note is that you don't have your playerclip/skybox aligned properly. Soldiers can jump up on the side of the wall and rain down death.
Speaking of which, I think the upper levels need to be fixed. Since soldiers can jump on the roofs of the buildings you have it makes it REALLY easy for them to camp from up there. What I think you should do for this is either make ALL of the upper levels roofed, or none of them. If you make them all roofed, make sure you player clip the roofs of every building.
What might also help BLU out for the final spot is give them somewhere in the upper levels where they can hide behind a one way door. It seemed that BLU couldn't get any forward bases set up, and I imagine that was part of why they couldn't finish it at the end.
On the outside of red spawn, as you go around the corner to your right there is an uplifed platform, it seems like it should be something one could super jump to. You might want to either raise it to the height of the platform right beside it, or lower it so that one could get on top of it.
I hope that helps, and the map was a ton of fun to play. I look forward to seeing what ya do with it from here.