Crowdfunding is a cool concept, in general. For D:OS, it might not be such a great idea. I'm not even sure "additional content for D:OS" would qualify as a "project" according to Kickstarter standards.
Of course, having additional content would be fine, and I agree D:OS looks promising enough to deserve a larger budget. I'd like to support the development of D:OS myself, and I can imagine there are many people out there who want to do so, too. Still, the Kickstarter project might fail, and that would attach a big "fail" tag to D:OS, encouraging magazines and websites to write about "the game that failed on Kickstarter", even though, ironically, there is and was enough money to see the game's development through. If you choose high goals that you don't reach, it can cause some unnecessarily bad publicity.
Like many people in Germany, I don't have a credit card, so I can't pledge on Kickstarter. And no, I won't get one just for supporting D:OS, although it's the game I'm currently looking forward to the most.
Since you're a Belgian company, have you considered using one of the European crowdfunding platforms? In the US, it might be taken for granted that adults have a credit card. In Europe, that's not the case, so European crowdfunding platforms often offer other means of pledging. They are also much smaller than Kickstarter, though ...
