Just got a few random suggestions for improvements that you may or may not wanna hear...
Firstly, I think it would make a lot more sense if the new SCPs' containment chambers could only be connected to corridors and such, since right now they can join onto other containment chambers, which seems quite odd. Other than that the way they work with the map is great.
Concerning 009 -
Perhaps to give the player a little more of an idea of what is going on, messages could appear as you die saying things like "You feel yourself stiffen", accompanied by the cracking sound. Also, I think that the locked doors should be placed so that you HAVE to drop down and be careful to avoid the ice in order to get through the room, thus providing a small challenge.
Concerning 005 -
Simply put, it is ridiculously overpowered. I actually avoid it when playing, because it takes away the challenge and fun of gradually getting better keycards (until you find 914 of course, but that's ok

). I'm not suggesting that you remove it, since it is a nice SCP. I just think it should either be very hard to get, OR have it placed near to the end of the game, since it wouldn't be too out of place around the offices. Preferably the latter though.
Concerning 1074 -
I may have suggested this before, but I think applying a paint-like filter to the image to make it 1. more vague and mysterious 2. more like a painting. Somewhat like this ~
Concerning 1123 -
Not much to say here; its almost perfect. Just perhaps have it so that the neat little jumpscare happens sooner, so you may pick the skull up afterwards (if you are foolish enough!). Aaaaand of course have the odd bug fixed and such
That's 'all' I have for now, keep up the great work guys. As childlike as it sounds, I kinda feel like I'm your biggest fan right now. :p