Just played the demo, and it was a great experience! You seem to have a good start so far, with some really good art and a protagonist who I think is really well-suited to the kind of story you want to do. Thus far I really only have two complaints:
1. The English version could use some improvement. You appear to be a Russian dev, so obviously English isn't your first language, but a little more polish would be greatly appreciated.
2. For people who read the books (like me lol) it's really hard to narrow down where this takes place in terms of continuity. Which isn't a bad thing, mind you, if you want to make it a 'greatest hits of Harry Potter' with the NSFW content. But I do wish it was clearer, because it will impact the characters you can reasonably use.