Gravity Rush 2 improves on its predecessor in almost every way. The world is more expansive, you have new abilities with which you can manipulate gravity, a multitude of quests has been added, and you can freely develop your own combat style.
It's difficult to determine what is more rewarding in Gravity Rush 2. The missions themselves are quite varied, but flying around to explore the vast world and its unique aesthetic is a pleasure in itself. Fans of the first game will likely think the story is the best feature, though, since it ties up many of the loose ends left by the first.
What makes this game special as a sandbox game is the fact that, despite having a definite overarching story, you are pretty much free to choose how you go about finding and completing the chapter missions. However, the combat is rather rewarding as well, since players can develop a variety of fighting styles -- all of which make excellent use of the key gravity manipulation mechanic -- to suit whatever situation comes their way.