Sad to say, but this kickstarter idea wasn't very well thought out. I think most of the people who would have pledged have already pre-ordered directly from the devs and they're not going to pay twice. Doing the kickstarter AFTER opening the direct pre-orders always has this effect.
Also given their fairly high goal, they should be pushing new screenshots, videos and dev diaries every week, otherwise they have no hope in hell of reaching that goal.
Then again, they've stated that the game WILL be made no matter what, so I guess this would just be an extra boost for the development costs.