I love the use of the bounding boxes for Iris's sprite instead of... a normal sprite. From the get-go, it hammers in the artificial nature of the implanted memories, which leads to the disconnection Lily fundamentally feels towards Iris.
[SPOILER]
I thought it was an interesting twist that Iris ended up enjoying Lily's defiance of her, in a way - maybe she liked the feeling of possessing someone that had the ability to leave her more than out of any lingering affections towards Lilian?