This movie is obviously Phil Tippett's interpretation of how our world works. I would compare this more to something like Holy Mountain than a traditional stop motion movie, the animation itself only serves as a medium for what he's trying to express. If he was a live action director, or a musician, or a painter inspired to do the same then no doubt we'd have a series of paintings similar to those created by Francisco Goya.
Scenes such as the electrocuted giants imprisoned eternally, and how the contents pouring out from them are reformed and pressed into a semblance of society, people formed from the excretions of past giants, or how they are in turn compelled to subject themselves to a nonsense babble elicited by a mouth on a screen that watches over them, are blunt and vulgar, mingled in with body-horror and an pervasive atmosphere of rot, are almost an assault against our ideas of normalcy, because they do reflect in a way how our society operates. There isn't subtlety to what Tippett's trying to say, but people might miss it because of how the message is framed. Holy Mountain was wrapped in junkie esoterics that matched the aesthetics and sensibilities of the time, and became a cult classic, while Mad God is a grimy and almost unpleasant approach. Holy Mountain ends with a statement of optimism while Phil Tippett declares very clearly the entire system to be mad.
Development wise he also obviously invests more of his effort later on in production, apparently the '30' years is a bit of an exaggeration and much of the progress was achieved durPost too long. Click here to view the full text.