"narrative focus" refers to the main storyline or central theme of a story. It is the aspect or idea that the story primarily revolves around and emphasizes. Full definition
The new central narrative focuses on all the new characters and very little on the original cast. (metacritic.com)
There seems to be a heavy narrative focus in the Humble «Game On» Bundle, which includes some wonderful narrative - focused games. (vg247.com)
Trauma is a creepy narrative focused game in which you walk through a mysterious dream world and encountering childhood memories and attempting to avoid bad ones. (freegameplanet.com)