Alright i just tested it reall quick (about 8 minutes)
First, the feeling is a bit Perfect dark-ish, which is great in my oppinion. If you have to look at the vehicles floating in the sky this is where you get to think that it really start to look like it even more. The flow is great, it's easy to get lost but i think that after a while you get used to it. Another part that iliked is the 'bridge-ramps' that links to each buildings. It's easy to switch to each other after jumping. 1 thing i noticed real quick was the lack of health pads in the level. Health vitals, adrenaline. Also, the redeemer next to the Keg health.
As for the framerates it was good, beside when i looked at the 2 statues at the same time looking at the whole level. There's a lot of details in the level, and the smoke emmiters didn't semmed to lag my FPS.
But good work on it. Nice statues By the way.