Hello, thought I would leave some thoughts here.
Looking through the comments, I'm glad that you have so many satisfied fans. Maybe I'm not the target audience for this game. I hope that my constructive criticisms can maybe offer a different perspective. I played Kurato's route and I played until Day 22.
Let me start off with the best parts of the game. I adored the soundtrack, it was beautiful. I also enjoyed the melodic nature of the sound effects. The character art was gorgeous as expected.
Parts of the game I did not enjoy:
The most significant aspect of the game that I feel was not executed well was the world-building. Nothing was cohesive or explained. Every supernatural character under the sun exists in this universe and no one bats an eye, but it doesn't seem like this was the intention of the work. Everything is supposed to be secret, but A: almost every single side character is a supernatural creature or involved in the supernatural (usually a balance of human characters or supernatural skeptics helps keep this seem secretive and realistic). And B: the MC isn't surprised at any of the supernatural creatures or events, when she should be. The first mention of the supernatural- the school ghost- the MC questions others if they believe in ghosts, but later when she sees it, she doesn't react at all. It would benefit the story for the MC to have shock and disbelief whenever she encounters any new phenomenon that normally would shock an average person. She just blindly accepts everything and then moves on a couple of lines later. There is no self-reflection at all. She just moves on.
The pacing also had significant issues. This story is supposed to be a horror story where the mystery of villagers disappearing is the main problem for the characters. But none of the characters seem freaked out or scared by this. Lioji in particular is extremely calm when he should be scared the most as he has insider knowledge. The MC often walks at night, breaking curfew, and isn't scared in the least. More emotional reactions would keep this feeling immersive and realistic. I couldn't care because the characters didn't care.
The pacing would improve if there was more push-and-pull to the events in the story instead of bad events happening quite often and then not getting resolved. There is never hints in the story, just straight events like villagers being kidnapped and killed. Nothing that could be creepy or is possibly ominous that the player could worry about or think about in the back of their mind. Things are told instead of shown, with low reaction from characters. I would suggest reading or watching more slower-paced horror to improve the feel of these sections. In particular, the first two manga volumes of Higurashi are insanely skillful at pacing, depicting scenes with hints of horror, slowly building the intensity until the reader realizes the true situation of the protagonist. Since the setup is similar, I couldn't help but feel that this work would be improved by adopting some of that strategy.
Finally, the dialogue just wasn't strong. The characters felt one-dimensional, due to the dialogue. For example, the scenes with the MC and her two friends don't feel like realistic scenes of friends talking together and having a good time. They just feel like characters either talking over each other or just simply advancing the plot. A lot of dialogue serves only to advance the plot. Additionally, the player gets tired of having mysteries about characters be hinted at by the characters themselves, then immediately unaddressed. In any normal situation the MC would press further for answers. Instead she just lets these topics go. I also thought that the romance felt very forced. It didn't feel organic. The characters would just suddenly get romantic when the cutscene art showed up on screen, then just forget it and get back to their normal personalities.
Plotwise as well some things didn't add up. A lot of characters were introduced only shortly before they became significant, so the player couldn't wonder about their purpose, it was pretty much instantly explained. For example, (SPOILER) Roya was introduced and then a couple days later, was killed. It is also confusing as he confessed to the murders, but the characters just chose not to believe him, and didn't show any evidence to the player. How is the player supposed to confirm that he wasn't the killer? Jace and Blace were also introduced suddenly mid-way through the game and were immediately involved in the main plot. (END SPOILER)
I really appreciate your work on this game and I'm glad that it makes so many people happy. I hope my criticisms can help you to improve this work. Feel free to message me to respond or if you want more clarification on any of the issues I brought up.