Do you happen to know any other size related games?
Oh, thus I know.
There were couple on Giantess City forum.
Also The Essence of Gender is an awesome game, especially if you hack money and level with save editor (like here, hehe). You play as human and can grow or shrink, also can gain fat or muscles. Though it is very rough, rougher and more complicated than this great game. And I believe it is semi abandoned too unfortunately.