I'm talking about creature transformations in terms of a game mode where at the beginning the game gives you the form of a fox, for example, and this form is on a floor and you can't change it until the end of the floor, something like that.
I see.
Currently there is the Legacy Mode, in which transformation are permanent. A feral mode may also be added in the future.
Most of such restrictions and gameplay alteration can be made by turning on modifications, once they are unlocked. One modification for example, randomizes the transformation parts you have when entering a new floor.