Everyone who buys the game in Early Access is buying the final game
We check steam every day and saw that most of the negative votes are refered to the price and the short duration of the game in early access.
Those who buy "Project Nightmares" in early access, are buying "Project Nightmares" cheaper, because when the final game be published, its price will increase.
If you buy the game now, you will have a short mission, it is true, but when the game will be published with all the new features you will receive it at no cost since the publication will be an update with all the content on which we are working.
The advantage of having the game in Early Access is that you can play the updates, see the changes in the game, discuss them, help improve the experience in the game, and you save money. We are open to new ideas that improve the experience of terror.
The story of the game and some specific mechanics will be shown at the time of publication. We don't want to spoil the story.
If you have any question be free to ask.