 Nomura was hesitant about releasing a Kingdom Hearts title on the Game Boy Advance , feeling that the 3D graphics of the original game would not translate well into 2D . Nomura changed his position after hearing that children wanted to play Kingdom Hearts on the GBA . After exploring ideas for the gameplay , he felt that a 2D Kingdom Hearts game would be possible , and that it could still feel like and play like what gamers were used to in the original . Meanwhile , Nomura wanted to give the game a " lighter tone " than the PlayStation 2 games . 
