I have the feeling that I'm the only one who actually likes time travel in Kingdom Hearts.
Things that I'd change:
- Kairi needs a little more character development
- Same goes for Namine
- Yen Sid's "story" should be explained (Is he a Keyblade master? How did he teach Mickey?)
- I would remove some of the "goofiness" (pun intended) of the Disney characters
- More interaction between Sora and Roxas (Like in the Re:Coded movie)
- The original story should be distributed more evenly, not 90% in the beginning/end (People will continue playing)
- Maybe explain some plotholes though some of the fantasy/mystery could get lost
Design wise:
- Sora's default face