Will it be in the stores?
And are you doing this own your own or working for a software company?
Yes, I'm aiming to release images / trailer to Steam Greenlight when it's closer to finished (people vote if they would buy the game and if so I will release it through that platform and sell it). Even if you don't buy / play games sure there will be some Youtube videos showing it plus I will be releasing videos footage myself once its further along to keep me motivated. I haven't decided a price or anything like that yet,it will depend on the games length but I wouldn't release it if I felt it wasn't up to scratch (it's not a money grab horror game and I want to be happy with it before I would sell it).
The gameplay will be exploring the house initially,being able to walk around and pick up objects and look at them (everything from the books on the shelves to opening drawers and finding out about the history of the house) it will then progress into more haunting / creepy horror. I've been toying with the idea of it flashing back to the house during the time the murders happened and also including a option to explore the house without the gameplay just as an extra.
I'm working on it alone currently,I might look into getting some help with AI , programming at some point if I need it.Some tools can be bought on a marketplace for the game engine I'm using which is cheaper so might be available by the time I need them.