Personally, I feel like the OST is what makes 90% of the game if not lower for other things. But, when a video game has an outstanding OST then the story is usually pretty good, OSTS in video games say a lot about the game, it’s sort of a silent storyteller. It doesn’t tell you automatically what’s going to happen, but you can gain an idea from it.
If you watch the movie, Tron, I think you’ll see how.