It's a fps that was recently released on GOG, I think it's developed by an indie studio.

It features a woman who is locked up in a mental hospital, you can walk around her room, look at letters related to the story and going to sleep makes her enter the levels.

There is a technology tree and a kind of bonus stage.

Thanks in advance.

Thanks for your help. :)

But youd been playing it. En train de jouer!
:/
I'm late.

Well in the meantime just before your answer, I finally found the name of the game.

you see the problem is that I have 991 games on GOG so sometimes I get a little lost. x)