Although not as good as KH II,the first game still delivers the fun of fantasy RPG from Disney and Square Enix.Good one!
The game has less items than KH II, but the gameplay offers original challenge, and, unlike KH II, players don't have to slam the Triangle button to execute cool, but too-powerful moves. The originality here is Square Enix's enemy designs and the base storyline. It offers a wide range of Heartlesses on different worlds.
But to me, the best part is, configuring and customizing my Gummi Ship! Players get to collect gummi parts and then shove'em all into their custom-made Gummi ships ala NFS Carbon.
For everything else, it's just plain fun. When you play RPGs and you don't get tied too much in the game. Explore the worlds... It is fun.