the big ai problem in HN2 is they can stop chasing you because u get on position higher, than ai thnks
first suggestion: make ai doesnt stop when chasing, it gonna be much harder to escape
second suggestion: if the ai notices an object that is out of their place, they can hide it somewhere, so it would make the game a little long to complete
third suggestion: ai can check closets
fourth suggestion: ai has offline mod: they can put cameras or something else like in HN1 it will make game a little harder to beat
fifth suggestion: make real ai which learns from its mistakes, and the same AI for all players (i.e. if the game is connected to the Internet, the game will make a request from the server and game will take data from the general AI. also sending the data to the server. )