Amnesia The Dark Descent - Story Ideas

[FlawlessHappiness]

The crooked room
I've been thinking about creating a story about a man, returning to his childhood house.
As he walks around fixing some small damage he finds some of his old toys. Voices and shadows starts appearing. Things start falling down. He follows a track of stuff that falls down until he gets to "The crooked room". A room that is crooked in a weird way. It's unsettling to him.
There is a painting in the room showing a boy. And suddenly, the boy smiles at him. Talks to him.
It turns out the boy is his old imaginary friend.
They start playing games as if they were children. fx. Hide and seek. (Boy moves around in paintings).
The boy's games get more and more violent as if he's trying to kill the player, and at one point you're forced to kill the boy. It turns out that once you were a child you did something horrible to the imaginary friend. You locked him in the crooked room, as you were playing Hide and seek, and then forgot about him.

I'm not sure about the ending yet.
Take it and use it if you want. I'm not going to finish it at the moment.