All of my yus. There's one thing you should add, if possible. If it's not possible, don't respond, but here it is: Try and add multiple multiplayer styles of play. What I mean by that, is try and add, not only co-op, but a mode where 1 person is any random SCP of their choice, and X amount of people are Class-Ds. If this is not possible, however, it's fine. This is only a suggestion. It would be kinda fun, running around as

and occasionally trying to figure out where you're going, while looking for the Class-D that looked at your face.
EDIT: I think that there should also be a way to edit the look(and perhaps gender?) of your character, because I've been wanting to make my Class-D(almost) exactly like me. I'm sure it would be pretty popular among some, as well.
But that's just my idea
Sorry for giant uh... Letters. I got outta hand with the text. :C