The Fnaf Killer thing was mostly a joke, but it is cool to see the gameplay improvements and design choices they make :P. (besides, fnaf already has the rule 34 covered.) Jumpscare thing does depend on how much work it would be, and what they are prioritizing, but considering it is an nsfw game, it seems a valid thing to put effort into. Interesting point on bringing up them standing outside the doors, I hadn't given that much though. Maybe its necessary since, unlike fnaf 1, you don't have the light switches, but it might be interesting to have them stay in the hallway for longer, and cut the time spent near the doors in half, That could incentivize players to spend more time in the screens preparing for cycles and less of their focus on simply reacting. There should be a right balanced where you don't feel caught totally off-guard, but are also surprised to see them if you weren't properly prepared and expecting them.
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Yeah. When they are in the door, it should be tense and not them standing there for a minute straight. xD The lighting is an interesting point. I suppose it is bright enough to see them easily which can be trouble for the door sequences. Hard to say if maybe a bit lower lighting could be interesting or playing with the idea of shadows. Either way, I imagine movements could help. There is bunny girl for example glued to the window and I think it would be interesting if she suddenly jumped away. Just to show dynamic movement to signify them as threats.