Well, FPSB is being dumb. So here's my feedback.
Basically my scoring was high on Detail and Ambiance, moderate on Balance and Fun and Gameplay.

Pros: A good, functional PL map. Lots of atmosphere and nice detailing. I like your use of cover and props. Has a fair variety of different combat situations.
Cons: The indoor areas, hallways and doorways are all very small and enclosed. It makes for sudden deaths and crowded fighting, especially with explosive classes.
Open areas favour BLU and closed favour RED, which is fine, but the narrow paths make it easy to mow down attackers pushing the cart.
The RED spawn is very easy to camp. It only has one small door at ground level, and the area around the exit is very open.
The final area is a bit awkward as a chokepoint - the water causes unecessary lag and the only real cover are the stone mesas, making it hard to advance.
It's a bit hard to distinguish what you can and can't jump up to, as a lot of varied height objects are close together.
Improvements: Maybe use some visual cues (fencing, objects, those corrugated metal plates) to distinguish which roofs/objects/etc are clipped.
Needs some more signage, just to point people in the right direction.
Your visual cues are developing, but not perfect. You make good use of colour to distinguish team direction at first but after that it's all just RED tones.
Clean up the final area, add some more sparse cover, just so Snipers can't control the whole field.
Open up the halls and around the spawns. Again the beginning of your map is more polished in this regard, but the rest needs some work.
Notes: Still an excellent, stable map.
With some work, it could be a standout, especially if you can get the balancing right as a single-stage payload.

Nice map.

Ok, thanks