Phenomenal. The thing that really stands out for me in the demo so far is that the choices have so much weight to them. The littlest deviation changes the ending dramatically, and every available ending was well-written and interesting. 

The art is great. The pacing is so well-done. One of the parts that struck me the most was in Neutral Ending F when Soren compared the player to Princess. I found that line brilliant.

Also, bless the devs for including a full spicy scene in the available endings. It was hot.

I would absolutely love to see the full game of this (hopefully also on Steam).