Ok, let's start off with the positives. The game is aesthetically gorgeous. I absolutely love the hand drawn visuals and I can only imagine that it must take you a long time to draw it. The story seems good, albeit not lore friendly (but let's be honest, which HP adult game is?).
Now, the criticism, please understand that I have NO developer background and this is only my personal opinion on hundreds of games I played and hundreds of hours I invested in said games.
The game feels incredibly barren. Basically you only drew the female lead characters, it would be nice to have the side characters too. It would be great to see some of the action, for example at the end of Chapter 1 you had Nikita fight MC, Hermione and Elizabeth, but there was no visual representation of that battle. We had to rely on description to imagine the battle. I would recommend that you fill in the blanks and draw the battles, scenes, side-characters, etc. Now I understand that it is incredibly hard to do all that because you hand draw all the visuals. But it would elevate your game into the stratosphere.
With all this said, I am confident enough to give this game my approval, and become a Patreon. Good on you, keep it up.
-Sortek