I would assume that would be the case as it's implied that control over voice and height will be obtained in the conversation with Aurora, Milo and Amber on day 13 when control over transforming the lower body is given. So far gametime is only a few weeks into a yearlong timeline, more transformations would have to be in the plans as even with slow paced transformations would run out of things to transform long before the year is up. Love the fact this game doesn't allow for blitzing through transformations.