I didn't wanna type it all out right away in case just no one had played it.
So, this is the summary of the killer's plan, from the in-game text log:
https://imgur.com/a/x3Y1yDX
So, from what they said, the killer was inside the manor setting up the chandelier and the wire and everything. And apparently, after setting it up, they... stayed there? And placed the fake phonecall via some method, from inside the manor.
I think Ideal said the killer's goal was to slip away somehow and take the gloves (evidence, because the gloves got cut by the wire or something) with them, at which point they could dispose of them literally anywhere and never be caught because they leave the island...? OR They at least wanted the detectives to *assume* that they could be anywhere in the world, even if they do decide to stick around and blend in...
But because Wato came early and opened the door and avoided the chandelier, Ideal said that this changed the killer's plan, because now they can't slip out of the mansion, because Wato is unconscious by the door and may wake up and notice them. They wanted to "facilitate their escape amidst the chaos", but now couldn't.
I have 2 issues with this:
a) If the plan was for someone else to open the door... Doesn't that mean 12 people would all do it at once? Or, up to 12. They sent a message to Ideal, who was at the research lab with a dozen detectives, and they didn't expect her to come alone. Ideal sent 6 people, but for all the killer knows, could've just had all 12 go. So let's say someone opens the door and enters first and gets killed by the chandelier, there's now 11 other people there. Even if you want to "escape in the chaos", are you really so certain you can get by potentially 11 people??? When they were otherwise scared to even go past one unconscious person?
b) They made a big deal about how the only way to leave is by taking the path. (I guess the idea of going through the forest is somehow an impossibility for these people...?) so even *if* they sneak out that way, for all they know, the other 6 who stayed behind at the lab could be on their way later and also find them.
Basically I just don't get how they planned to sneak out of the manor, assuming they do it after the call is placed and/or after the body is found.
But more importantly:
If Ideal was at the research lab with... what is it, 11 other detectives? (Cast is size 14, minus Ideal, minus Wato, minus old dead guy) And she's now deduced that the killer is someone who was in the manor in advance and set it all up... and then she says "But the killer is in the manor, among us right now"... then... Doesn't that... rule out all 11 of them? If they all went to the manor together after receiving the call, then it can't be any of them. The killer would immediately be blatantly obvious even if they did the cliche "join the crowd and pretend you were with them all along trick" because 12 people had to all come from the research lab, and they traveled together.
So is Ideal saying "the killer is in the manor still" and is among us? Or is just hidden somewhere? The follow-up after chapter 1 makes this unclear, because if you think they're hidden in the manor, you just keep the front door locked (I believe it was said there's no other exit anywhere because the building is sealed) and keep it under watch, but then when there's a light at the helipad they say "oh, maybe it's the culprit", but you just said they were in the manor so how do they now think the culprit got out? Especially if they think it's one of the 12.
But it shouldn't be possible for it to be one of the 12, because they concluded the killer was in the manor before the call was placed, and all 12 of them came together (6 at a time, but still) from the lab, so that should make everyone innocent, but they also haven't declared that.
So... yeah...