Interesting demo, yet convoluted plot.
From the start of the game, I was fully immersed in the environment. The atmosphere is eerie, the protagonist is actually interesting. I liked the connection between his past and former self as being someone, who has had a terrible childhood, which is why he is visiting his grandma. But, the connections don't really make sense, at least in the demo. I understand the full game might shed more light to the story, but so far, I was lost - why was grandma doing well after what Dave saw happen to her? What is the cult about and how is Dave involved? Who is Eric? Many questions like that.
The project truly has a potential. I wish the best for you and your development team. Good luck ✌