There is a law of erotic 3d games: The more customization of the character the worse quality of movements. (if not look at any illusion game).
IO didn't become famous for its character customization which was rather limited, but there you have it as the game with the best hentai scenes ever, the most fluid movements that almost seem pre rendered.
I'm worried folks, I'm not liking this demo, I tried to create the most sensual character I could both in this demo and in the IO demo and the result of IO is much more erotic.
The face in IO is always perfect, no matter how much you move the settings it always looks good.
The sliders in IO always make the body look attractive, special mention the fatness control, which makes it even sexier, Summer's is too realistic and the added fatness is not attractive.
So far the breast controls are too limited to give an opinion, but again IO is sexier.
I remember with the IO demo I was entertained for weeks, with this one I am already bored.
I edit to add, the IO demo was more generous with fully interactive hentai scenes, plus it told part of the story.
IO demo: 1.3Gb
Summer demo: 800Mb