Hey, your game is absolutely terrifying and sooo cool. You did a great job !
(sorry if my English is broken, I'm French ^^)
BTW, I've got some improvement idea :
1) If you hide too much in the closets, the AI will learn from that (like in Hello Neighbor) and it will be a nice addition to add a jumpscare where she is already in the closet, but you don't know and jump onto you when you try to enter inside
2) When you try to brute force the keypad and fail, it would be nice if it made a big buzzing sound (like a sort of alarm) so the player need to run and hide before the AI come to the headmaster's office
3) Maybe add the option to close the curtains of the classrooms, so the AI can't see inside, but the player also can't see if she is outside, and she can “guess” the player is in a room where the curtains are closed because other in the other rooms it doesn't
4) Making her switching the light off when she pass by a room where the player have turned on the light, so the player will have less hint of where he has been (a player can just turn the light in the rooms that he have already cleared) and maybe if the player is playing too much with the light she can return to the electrical room and just shutdown all the lights