Alright you baited me in the Umineko thread a month ago and I waited to read this; then I saw it again on /agdg/. It was all the fault of Magical Chef Godha.
Mystery-wise I see my old friends the reverse order locked rooms (simplified), the impossible master keys, and the damnable Shkannon red herring. If you reached the Golden Land understanding the mysteries is the easy part, author himself seems to give up the mysteries waaaay too easily, immediately explaining them after they occur. I guess the characters all read Ryukishi at some point and died on Ep2.
Also because the killer literally allows you to name anyone, we HAVE to assume someone did the shed-killing trick without slicing half the face off. Which leads me back to exposing the mystery really early because that's the only logical assumption we can make, even though it's a really classic one...
The hard part is trying not to laugh and cry when you are hit by THE POWER TO MIND HACK at the climax of the game, because if you read Umineko and your mind is set on the Umineko track you don't really see this one coming.
That one probably could have done with more foreshadowing; because if only 1/5 people believe in it, it kind of weakens the credibility of the solution a little. That's probably another weak point of the story; there's not much tension about John Wick and everyone seems to go about their daily lives like NPCs.
In a setting where everyone had a similar face, my initial hypothesis was clones. (because you know, cyro lab) That was probably the part I didn't like the most because I'm pretty sure that the Zero Time Dilemma solution violates SOMETHING and makes Dlanor cry, even if I don't know what it is.
I'm not the greatest mystery reader, but I enjoyed reading something made by someone who read Umineko. If this review makes no sense to a passing goat, it was because like this game it was written with love and you can't see it. (laugh)