You paid $1300ish 3-4 years ago. I don't believe backers paid him enough to create a factory and hire his own employees. He claimed that he invested $1 million of his own funds into this project. Therefore I would not be so demanding.
Additionally Kickstarter rules are clear. He owes backers nothing.
I worked at a startup where early VC investors were worried about the company folding. So they constantly called and emailed everyone until it folded. Kinda ironic.....I would keep quiet and show some appreciation.
Thanks
Yan