Banger game that heavily improves upon every part of KH1. Huge fan of reaction commands, drive forms were cool although getting them to level 7 for abilities sucked and they made summons basically useless, and the new characters and worlds were all neat (esp. Twilight Town with the amazing opening & Hollow Bastion). Atlantis was a huge downgrade though since the music sucked and I was one of the few people who actually enjoyed playing it in KH1.
Gummi Ships were my least favorite part of KH1 so not super happy that they returned, especially since only 2 of those levels I actually found cool (highway & castle raid).
Very mixed on the final boss since parts of it are cool, parts are underwhelming, and the finale I found frustrating.