The phrase "narrative developments" refers to the changes or events that occur in a story or plot. It describes how the story progresses, new information is revealed, or unexpected twists happen. Full definition
This award is given for outstanding storytelling and narrative development in a game. (allgamers.com)
But I bring it up because I see the broken promise to the player as an example (admittedly extreme) of a slightly more widespread trend in game narrative development. (gamesetwatch.com)
The story is pretty interesting, albeit a little predictable at times, and if narrative development is something you desire in a game's focus then you won't be disappointed. (bitcultures.com)