also, ive noticed more and more frequently that some cameras are being blocked off by walls, rendering them useless, and as much as i like free money, it seems kinda weird
also, have you considered adding some kind of shop? maybe a vending machine can be randomly generated in the levels that sells things like a deployable box to hide behind or a firecracker that goes off after 5 seconds that can be used as a distraction, but if you cant drop it in time, it explodes in your hand and you get knocked out. again, this is probably some crazy stuff to code, and im just rambling :P, do what you want
Thanks for the suggestions! Ramblings and brainstorming like yours has helped and been implemented before, and I really like hearing peoples ideas! The vending machine and deployable box was new and interesting, gettin' the gears in my head crankin'. :)
About making noise, you can walk into almost any of the objects to make a sound that guards react to. They'll look a random direction and then turn 180 to continue patrolling, so it's possible to steer them a little bit.