Love the homicidal AI and the overall tension of the game-play. It's scary! No way to approach this game in a leisurely fashion. I think the AI is at a good level on both easy and hard but I hope there will be more locations to hide in such as bigger/additional building. Ok, I found the WC's so no need for those. It would be a little neat to see some pocket doors that are common in Japanese schools.
Also maybe add some objects to be used as distractions and / or to slow her down a bit and make the AI more "angry" and aggressive! Maybe on hard or super-hard level have a stamina limit on the player and maybe the stalker.
Anyway it's tons of fun at this stage! Great!