I thought it very peculiar that the bathrooms were in a separate building. And why the segregated toileting just for freshmen? That's all just weird. Seems like either an epic architectural failure or a very transparent plot device. It took me out of the story.
The high point for me was:
Other than that, it didn't do much for me. The janitor's fight with whatever-it-was was poorly described and didn't seem serious. His leg is injured, but we weren't told how, and he isn't depicted as feeling pain.The intense stillness was finally broken, and movement began again, as though the world was releasing the breath it held.
Give us some sensory input besides darkness (which is really a lack of sensation). Shouldn't that place stink? He saves that job for last because it's disgusting; make it stink in especially creepy and unexpected ways. And why isn't he equipped with a mop-bucket, at the least? The typical janitor's cart is full of weapons; arm the guy and make the fight serious.
I was unable to really connect with this guy in a way that would make me care about him; there's nothing in the way of character motivation outside of his job, and scant little there. Up the stakes and give us a reason to care. Doesn't he have a family that he has to stay alive to support? A car payment? A gambling debt to the mob? What if he was scheduled to donate an organ to save the life of a loved one -- and his appointment was the following day?
As it is now, the used-toilet-paper-monster could take him down, and the most I could do is shrug.