Uhm, i ques your best change is to sign up for the news letter, u can do that on their website http://www.dualthegame.com/#latest-news.
I copied this from their website u can find it in the latest news section, at kickstarter goal reached;
We’ve received lots of feedback from people wishing to pledge after the Kickstarter campaign. Thus, a new crowdfunding website is currently in development to help us reach our stretch goals. It will also feature alternate payment methods, including PayPal, and will provide backers another way to access similar pledges to the ones on the Kickstarter campaign. To be informed of the site launch, sign up for the newsletter.
Good luck !