The Chubby MicroDemo uses art of Cyan Capsule, but it's mentioned, legal and Cyan doesn't against it. MicroDemo is small and now is not really worth playing, because WPT released his new game Chubby Story.
The Chubby Story has it's own art and has much more content, also it's really feels like a game and not a demo, because it has got needed features like saves, settings, etc. Also there is a CG gallery.
I would rate Chubby MicroDemo as a below average for a game, but according to it's name it just a demo. Good new that it has no grinding.
The Chubby Story not that long, but is pretty good:
I've not encounter any bugs;
Art is good;
There are animations;
Piggy is interactive, she reacts on groping;
CG gallery;
Writing is fine;
There are "barks" voicing;
Music is fine;
There is a stat system for characters;
It's Free.
Downsides of Chubby Story:
Acceptably short. But it's a first version.
In the end I would rate Chubby MicroDemo ~3/5 and Chubby Story 4.6/5 (if our rating system is kinda generous).
Probably this games should be rated separately.