I've played hundreds of IF games, but the only one I can honestly say has changed my life is Save the Date. This game has empowered me and helped me live a more intentional life.
It's much more than it appears on the surface, and that's all I can say without spoilers. Play it blind. Play it now.
(Spoiler - click to show)Every time I play a game or watch a movie and I don't like the ending, I think of Save the Date, and I choose my own version of the story. I no longer treat the creator's version as the only authoritative one.
This new perspective has spilled over and empowered me in other subtle ways as well, helping me live a more intentional life, to be the co-creator of my own life-game instead of just the protagonist.
It's one thing to understand Death of the Author in an intellectual way. It's entirely another to be the player who kills the author by your own hand.