I haven't finished the demo yet, I'm just to the part after you meet with Hiro at his hotel. But, so far I am really enjoying it. I like this time period/setting, and the backgrounds and music are nice. I also quite like the characters I've met, and I'm very interested to see how the process of building this machine will go, and what the effects of that will be.

If I had to voice any complaints, I would say that there are a few spelling errors I spotted, and it looks like the character art was done by two (or more?) different artists, which is a little jarring visually.

Edit: I've finished the demo and I had a lot of fun! I really liked every single one of the LI's, which is rare for me. I'm very excited for the full game. With a little polish, I really think this game will be something special.