I honestly didn’t think it existed either, but it does. Developers behind MONKEN found 201 rather generous patrons, mostly giving ~$100 USD each. The crowd funding site used is called Campfire. It looks and operates a lot like Kickstarter, only taking whopping 20% of the collected funds. Ouch! Funding is also “all or nothing” like Kickstarter.
MONKEN is a rather strange game. I first heard about it over at Bit Summit in Kyoto. Seriously. A game where you play a wrecking ball in order to free hostages based on an event in Japanese history! MONKEN means wrecking ball and watching the hostage crisis unfold on TV left a huge, maybe spherical impression on concept creator Fumio Kurozawa.
Go forth and read about it. I know too little on the subject to do more than just ramble away.