Right out the gate without even playing the game I can say: I hope Ruby and Jade (see animated screenshot above) being twins has a meaningful impact on the story - because from a gameplay perspective, two mayor characters looking the same adds tedium and might look rather lazy on your part.
And to avoid being misunderstood: If you want to keep the game world that way (because it does add to the story) that’s fine. But maybe you shouldn’t put that part into your promotional material.