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To answer the question(s) logically:
First, the story is already written, from beginning to end which means Mr. Palmer gives his instructions to the artist to do A, B, and C.
Second, more computing time is needed to generate the art than it does the text, so the artist has to have a lead time so when the rabbit catches up to the turtle on a given scene, the turtle has already finished that scene and is working on the next.
Third, it's easy to see the developer painfully going through every detail to present his story the way he wants the audience to see it. APM isn't just some game in some weird world setting but a take on the most unlikely of real-world events happening in the real world.
Fourth, based on logistical, technological and story development some future events none of us will see or know of are being worked on. I'm bashing my brains out where I saw this game in another site and one of the caption pictures shows Marvin and Anna walking up stairs. I found it on a Bing or yahoo search, places that Google will not lead you to information on the first few pages.
Fifth, even though this is a "hobby project," its damn good. But it's still a hobby, not a job or career. If my hobbies were as fun as my work, I'd be finding new hobbies