I just finished up all routes. I strongly agree with chris09, that I wish it had been longer.
The only gripe I have, is that both the main story, and the route endings, came to an end a bit too abruptly. I believe the game would have benefited greatly from route-specific epilogues. Even still, it was a very, very enjoyable experience.
I would give it a solid 8/10, held back a bit the feeling of being cut short, but still strong because of amazing writing, and overall very strong relationships/routes.
Personally, I got sooo misty eyed throughout both Jessie's and Becky's routes. So heartwrenching, and ultimately beautiful. Lily/10, would cry again.
Ermengarde's route was also very well written IMO, with the growing feelings wonderfully presented.
I really liked the direction Lavinia's route was heading, but it needed more time to reach full potential. Still very enjoyable though.
Mariette's route was pretty good, although I had hoped to hear more about her life and about her as a person, not just as a maid. An actual romantic development would also have been nice. ....She is so very pretty....
Lotties route was cute and all, but as someone who's not overly fond of children, I found it to be the least interesting.