I enjoyed it overall. Japanese horror is always a bit unhinged and morally disturbing, so I was not too taken aback but yeah, it was a shitshow hahahah. It kind of reminded me of Grand Guignol.
I haven't read the manga and I felt a bit confused at some point, but it was nothing to bothersome. Stuff like the reason for Zera's goal and crazyness, for exemple.
I loved the acting, the cast did a really great job, especially Tamiya, and the characters were all great (I mean, as characters, not as people obviously). One thing tho, at the beginning they introduce the characters with one clear stereotypical role/personality each: like there's the nerd, the emo, the stupid, etc... so I thought they were going to be caricatures, but then they dropped it and those roles were no longer portrayed at all throughout the movie. Which I think is great, I would have hated caricatures, but then why introduce them like that in the first place?
I was also confused with how they handled Daff. The whole Tamiya, Daff, Kaneda thing was super wholesome, and I was expecting them to die and feel sad about it. And you can see it's what the director tried to do: make you sad about the original hikari club getting crushed. But then why have Daff do such a shameful thing? I mean, just touching a woman and wanking to it already made me lose all sympathy I had for him, but they made it even worse by showing everything, in the most humiliating/shameful way. So in the end I was like "Poor Kaneda and Tamiya for losing what they loved the most, but Daff you can die idc." Which isn't what the director was aiming for I would guess.
The colorimetry was awesome, it was really beautiful to watch. And I'm not a fan of gore but it was ok I guess, and although it wasn't very realistic it was not too ridiculous either. Except for the guy who got thrown against the wall, I laughed so hard at that one.
Anyway, don't watch it if you don't like being morally challenged and if you don't like gore, otherwise, go for it!