Great detective game with a great artstyle.
I don't play much visual novels but the writing felt really good. Only in one instance it seemed out of character, when talking about fishing with the Butcher. If I remember correctly he responded "Where have you been all my life?", which felt too similar to one line the Engineer said a bit earlier.
The gameplay is also really good. The log and dialogue options really put you in the detective's shoes. I kinda felt bad for faking interest in the anime the Engineer was watching. I liked all the characters and the fact that some plot elements connects them. Maybe the Butcher had a too central role in that.
At the end I finished all the dialogue options with some days to spare (and I wasn't even optimizing my schedule). Maybe you could add an option for submitting your answer early in case that happens. Apart from that the progression felt natural and the events interesting.