I polished my idea on alien invasion and wrote down the whole story. I want to be able to mislead the player into thinking they are the hero of the story, only to find out the opposite by the end.
Here is the first official description:

I want to be able to place this story in a three act structure so that the concept can be more clear and precise.
I also want to be able to add more interactivity in order to move the story forward, and to be able to have a good use of the medium.