Its not terribly surprising. Some people will just pirate everything they can. Its best not to worry about those types. You're offering 5 games available on Win, Mac, and Linux, with no DRM and you can buy it all legit for $1 and they STILL pirate...theres no reaching them. They will never give you a dime.
But on positive news, the deal is over and they made $1,030,870! Of that, $319,861 is going to charity. And since they hit the million dollar mark, they are going to release the source code for Aquaria, Gish, Lugaru HD, and Penumbra Overture!