I've played through it and I like it^^
The art is really pretty and I can see that you've put a lot of effort into it. Not just the portraits, but also the little cutscene in the train. The maps are great and interesting, too. I'm a big fan of steampunk XD
Unfortunately, while it's an interesting idea, there isn't much story. You don't find out a lot about the characters or the world. Like, why is she mute? Where are her parents? How come she can see and talk to the horseman? (Interesting idea btw to add the horseman into this story. How do they fit?) And what's the difference between normal humans and ones with animal ears?
Also, the way it ended felt a little weird. It would have been great to end it on a cliffhanger and while I'm sure the time limit was a problem, the last scene could have been extended just a little to create a cliffhanger.
In conclusion, I really love the art and the world. The story seems promising, though it was a little short. I'd love to see more of this game^^