Great art style. I hope you plan to add many different environments, and not only the mannor. Dungeon, a garden, greenhouse, clinic, all great oportunities for victorian-esque levels/areas.
The controls are fine. I wish you could add controler support as well.
The inventory I would say still needs work. Probably is incomplete at this stage, but I tried to click on the other tabs and they did nothing. I tried to click and drag items to sort my inventory but couldn't move them. I don't like how we read the lore papers. Better have you open a big page in the middle of the screen, where you can read the text. You can use Divinity Original Sin 2 or Balur's gate 3 as reference for this.
I love that we can change the equipment, and it reflects on the character.
Make it so that we cannot pick up random items. Only items that have a purpouse/can be sold as loot maybe.
Could not advance after the group fight. End of the demo?
Overall, it is still very early in development, but good job. Keep it up.