Strange idea

i had a story idea, one that others have done but with a twist.

The idea is that a boy is playing a video game he has played many times before, he knows the story inside out and backwards but really loves the game. however he somehow gets pulled into the game itself.

He ends up as the villainess, and he knows how the story goes...she dies. It's at the beginning of the game so he has to try and stay alive, and maybe change how the story goes while trying to get back to his world.

I thought it would be an interesting idea since our protagonist actually would know how the entire story progresses, and thus can make changes, but the mroe changes he (she) makes, the more the story alters itself.