The tiny, box-like rooms were the worst part of the game, especially because the few areas that were not like that were awesome. many of the level s were also very poorly designed and focused on sloppy platforming over the fun interpretation of RPG mechanics the game had.
The entire Alice in Wonderland and Aladdin segments were porbably the chief offenders. Alice in Wonderland had the cool room that changed size and spun around, but the rest was just ugly, especially the forest. Agrabah had so many little tiny rooms with tons of loading, which were somehow all one large area in the boss fight and the Cave of Wonders was wretchedly designed.
On the other hand, the giant Boogie tower was awesome and Hollow Bastion was brethtaking (even if it felt a little restricting). The final level was also very impressive and very open overall.Too few levels allowed much interaction with the often fascinating environments, and the invisible walls made much of the game seem sloppy, while other levels were fantastic.