This game was a very pleasant surprise, I didn't expect it to be that good, actually.
The characters were great, dialogue was extremely funny, the gameplay was good (yes, I didn't hate the Somniums), music is top notch, the story was engaging (though it sometimes had pacing issues), amazing voice acting.
My only major problem with it is some gameplay segments were a bit awkward, especially the action sequences, which were good, but took too long for anything to happen so they end up losing a bit of impact.
Still, I liked the game a lot and it definitely is in my top 10 VNs (that I have played)