Game Writing; Narrative skills for videogames edited by Chris Bateman

"Writing an effective nonlinear game story is a challenge because story and game are essentially incompatible. Their end goal is similar - each seeks to create an unpredictable, yet highly satisfying entertainment experience - but to achieve it, they rely on opposite constraints. The power of a story comes from its structure. The power of a game comes from its freedom."

This passage highlights the importance of the balance needed between story and gameplay. If the game is too story driven the audience will feel like they are not achieving much and the game will begin to feel to linear, however if the game is too gameplay driven it can often become hard to understand the flow of the game.