Uh yes there is. Enough to significantly change how the second half of the game plays out (the Savage Jungle is VERY different) and being Evil gets you a shortcut to skip a huuuuuuuuge part of the Temple. Lots of smaller things change in the Citadel, the City and the endgame too, including of course the ending. It has more C&C than most other CRPGs that claim to have it actually.
Huh, completely forgot about that, ty. What I meant was from a game mechanics perspective but maybe I'm wrong there too.
In terms of mechanics themselves you're right. The paths for example change the timing with which you get the various curse control talismans, but you still get them all in the same order. Spells are the same. There is one long-running weapon choice you make quite early. But the gameplay does change a lot in some areas as outlined above, including puzzle solutions, and in the Savage Jungle it's really quite a big difference, as on the Good path you get a lot of talking and NPC interaction, and on the Evil path you just slaughter everyone, and which of these you do then affects a boatload of puzzles and situations throughout the rest of the game.
But you can, only later in the game. In fact it's a great sense of accomplishment when you're finally able to shapeshift into the lizard and back into human form (nobody in their sane mind would want to transform into the monster, however). There are some points where the transformations can be bothersome, but as far as I can remember when you actually need a specific form to advance, then the required transformation will trigger.
