Like many computer games, it creates a world which the player may manipulate, but unlike a real game, it provides no objective. A toy is interactive. But a game has goals. The idea that games have something to do with stories has such a hold on designers' imagination that it probably can't be expunged. It deserves at least to be challenged.
Stories are inherently linear.
However much characters may agonize over the decisions they make, they make them the same way every time we reread the story, and the outcome is always the same If the characters did something else, the story wouldn't be as interesting. Games are inherently non-linear. They depend on decision making. Decisions have to pose real, plausible alternatives, or they aren't real decisions. It must be entirely reasonable for a player to make a decision one way in one game, and a different way in the next.