>>717689245
Not too much for most of the storyline (although the final chapter goes off the rails with Sora's PTSD rollercoaster), but the combat and platforming are vastly improved compared to Days. Pic related summarizes the plot in a single line. Each world switches things up once you hit the Keyhole. Data sectors have glitched heartless enemies that give them buffs.
It also has the best command deck system in the whole series. Definitely worth playing.