As a fangame it kind of works, and having just finished most of the canon mangas, I felt like I could appreciate the character dynamics a bit more... but the enemies' attacks are genuinely scary, or rather, very gimmicky and it's unlikely you're going to react on time during your first run. And I have played through a lot of stuff.
Music is fitting but not too great, character portraits are somewhat charming, and the amount of characters is a lot.
I pray for whoever wants to clear Normal Overdrive though.