Excellent start! This game is oozing with charm, more than enough to set it apart from the sea of similar games. The writing and the art is excellent, and the gameplay does a good job mixing lewdness into the combat.
One bit of feedback I will give is that you really feel the lack of character progression. With no xp or leveling system, and no gear to buy with your money, there really isn't any incentive to battle. And since you can't run away from battles either, they quickly start to feel like a chore.
Obviously this is just a demo, and I have no doubt that over time this won't be an issue. But it is something worth bringing to attention. I'm excited to see where this project goes in the future!