also is there any other art or game featuring size difference?
Looking through my library, Liliths Lair has some giantess in it depending on which path you take. Soulstream Expansive is heavy on giantess'. Cherry Kisses has a slime girl, so there's some morphing of body shapes/sizes. Gourmage vs The Dragoness has a giant dragon you feed.
(Can't really think of any with tiny women though, maybe there's just not enough games out there like that yet.)
The new game I'm working on, Glore, will also have Giantesses in it later, since it's based around Goddesses. It's still a Prototype though, but eventually will have a variety of body sizes throughout the different Realms~