I've played your game, and liked it! Maybe it's because I have a bias for Victorian-era stuff, but I loved the atmosphere of your game. It actually felt very Victorian! Of course the images helped. The backgrounds were good, I felt that the old photograph look fit the game very well. The portraits took some time to getting used to, but the characters really looked like the way they were portrayed, so it's fine. The music also fit well. The story was a very good mistery, and it had an supernatural feeling all over it...
...Even though in the end it is entirely realistic and has no outside beings involved. When it came the time to choose a suspect I got it right on my first try, since I had a suspicion that she loved him more than just family-like. I had a difficult time getting there though, and this is my complaint about the game. (Of course, I have to be nitpicky, haven't I?*Sigh*
) Although you give enough evidence about who is the culprit (by the way, the amount of clues was just right, not too much and not too little) finding the path to the final decision is very difficult, and the choices don't make much sense until you've played through the game long enough, which can be quite frustrating... And there are many choices throughout the game, which is both good and bad, given the thing I just mentioned. But don't let that spoil the review. This was a great game and I really enjoyed the challange, even though I had to run in the dark for a while.
So congratulations on your release, Monkeju! (And it was a really quick release too... I'm impressed!) And thanks for mentioning the source of the pictures. It will help me a great deal, since I am doing a Victorian Era game myself!