This is really promising! You did a good job trying to capture the general feel of older horror titles and the design of the estate is remnant of that period. I really enjoy the candles being strategic sources of light and the story is fine.
The inclusion of another "character" to interact with periodically is smart (if you use him well). Indie horror has moved away from that but experiences where it's just you and enemies aren't necessarily scarier.
Keeping in mind that you're just one person, there may be some things you don't have the resources to deal with yet, but my main issues with the demo were the combat, the low health filter over the screen, and the save mechanic not working properly.
Also, there's a serious lack of detail in the shadows, which I see in a lot of indie horror games. I don't know if it's a conscious choice or a technical limitation but I'd rather horror games be well lit so all details are visible except in areas that should be completely dark.
Try to rely on things like pacing, the shape of lighting, and sound design for atmosphere instead of everything just being hard to see. Dark games aren't scary. Selective use of darkness is scary and the darkness needs to make sense.
The pacing did drag in parts but you can capitalize a bit more on scripted events. The first appearance of the nurse was good. Wish you had zoomed in further so we could really get a good look at her.
Overall this has potential and you should be proud of what you've accomplished so far. I had fun playing it! Keep it up and good luck with the rest of the game!