id suggest maybe making her start off friendly and slowly turn crazy make it so you can talk with her and do actions which make her angry like fixing the generator which she turned off to keep you there maybe you could explain your way thru but when the doors unlock she goes completly crazy and goes all out to kill you from grabbing your legs in vents to just like anime style i found you your mine bitch type shit like super being type yan aka in point form
1.make her start off normal
2.slowly build up to a epic sorta chase where you must run to the doors before she just wipes you off the face of this earth
3.add vents and other things
4.add sorta interactions with yan where you will be walking around to go idk fix something and she will appear and question what your doing
5.make a system where if you fuck up to many times you just die she right off just slits your thoat open and drops you and says something along the lines of maybe we were never meant to be together you whore
and also add 2 other sorta things as well maybe
good
you played good boy or girl and didint anger yan much she desides to let you go after you sit there and talk with her for abit
chase ending
you never said or did anything to anger yan fully so she didint just kill you instead you and yan ended up in a chase and her unsure self made it so you were able to get away
and well bad being what i said above with the whole just not caring stuff you do to many bad actions and didint talk with her or you swared and acted very naughty towards her
and that being you could also add good and bad actions bad actions would be escape actions and good ones would be like talking to her getting her a drink something to eat eta
the problem with games like this is you dont want to auto kick into action it just makes it even more repetitive with the elements below it allows for choices and also allows for some breathing room for the player but whatever you think we are all diffrent and i personaly think the main killer would be annoying to deal with and could even end up just at a stalement 24/7
Thanks for your feedback, I would be implementing some thing similar but would most likely be towards aggressive behaviour whether it would be starting of as mild aggressive later becoming fully psychotic but it wont be any friendly behaviour because the game focuses more on dark theme and horror genre.
well when i say friendly i mean creepy friendly like activly stalking the player and always checking in on the player and as such to get a perfect ending you could make players play smart and carefull maybe we need to read her diary to find out she likes some type of cake this would be something that would make her snap where if we dont let her see it she wouldint know more noticable things like the lights coming on would be pretty clear