Otome fans will love this game. The quality surpasses many other games of the same genre. The writing is polished (I noticed only a few typos), the art is nice (the colours give it such a calm yet mysterious nighttime feel), and the music is lovely and atmospheric.
For me, it was too otome, so I played through only Aedan's route. I prefer games where the romance takes the back seat and lets the story drive. I felt nothing really happened, except the romance, until the 5th or even the 6th day. And there was a bit too much blushing, tingling, sighing and flirting for me. But this is absolutely a matter of taste, and as I said, true otome fans can't go wrong with this one. :)
SPOILER
Honestly, I thought it would have been amazing if Aedan had turned out to be the evil one instead of Night Queen. I'm weird like that, lol.