Director Keiichiro Toyama made the suggestion after picking up the 'Game of the Year' award at the Tokyo Game Show.
Responding to a fan's praise on Twitter, Toyama tweeted: "Thank you! I'll do my best on the sequel."
When probed for more details about a potential follow-up, Toyama said that it was a "secret".
Originally slated for the PS Vita's launch window, Gravity Rush was eventually released in June.
The game stars a girl named Kat who has lost her memories in a futuristic world ravaged by gravity storms.
Kat has the ability to manipulate gravity, which players can use to explore large open-world environments as well as for combating various monsters created by the gravity storms.
> 'Gravity Rush' review: Turn your world upside down
Watch a trailer for Gravity Rush below: