Final Fantasy and Disney character in the same places...
KH stars both Disney and Final Fantasy characters. Some of the Final Fantasy cast includes Squall Lionheart, and Cloud, among many other well known FF characters. Some of the Disney cast includes Donald and Goofy, who are your partners through the game, as well as such characters as Aladdin, Tarzan, and many many many other characters from many of Disney's most epic films.
KH is played by traveling around various disney worlds, which include Tarzan's jungle, Agrabah, Hollow Bastion (Beauty and the Beast). One of the drawbacks with this game is that it focuses on Disney way more than Final Fantasy. You never get to visit any Final Fantasy worlds.
One other drawback to this game is all the other party members you get are all disney. You get to battle agains a few FF characters (such as Cloud) but none of them ever fight beside you...which isn't cool seeing as how you see a lot of your Favorite FF characters in the game.
KH is live action, you run around the area, defeating the Heartless, which are the primary enemy of the game and the cause of your adventure. Now since this is a Disney type game, the hero does not weild a sword...only FF characters get to weild swords (such as Sephiroth, who is an optional boss), instead, Sora weilds a Keyblade, which he uses like a sword. But the Keyblade is important to the story, because it allows Sora to seal the worlds he visits so the Heartless can't enter them. You may still, so don't worry about sealing them, you are free to come back.
KH is a very good game, and the only drawback I can think of is that there isn't enough FF to entertain me...I love the game but I wish it had some more FF in it, such as FF teamembers at least, but a good game none the less, and I reccomend it.