That beat, that harpsichord (?).
Very fucking cool concept for a song, the only Victorian Ballad I can really recall. Good choice in vocaloid, awesome beat, good samples, great mixing. Everything comes together rather nicely and it creates a really unique experience. There's not really anything I have to compare this to to provide better critique.
However, one thing is that "Laissez" is pronounced Lah-SAY, not LAY-siz. Additionally, the opening chorus sound more unnatural than the rest of the choruses. I'm not sure whether this is intentional or a result of there being less musical elements to cover it, but it's an issue for a very short period and only affects the track in a minor way.