From the comment section on Kickstarter:

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Hi all, we're aiming for either this week or latest next week to release the alpha. No promises on the exact date, but the list of things we want to fix before giving it to you is finite & is getting smaller real fast. The reason we keep on postponing is really simple - we want want your first contact with DOS to be an enjoyable one instead of a frustrating one, and that requires there to be a certain level of polish in place. There's about 7 to 10 hours of gameplay we're thinking of releasing with the first version of the alpha and that means that just testing one build already takes an entire day, meaning that progress isn't as fast as we'd necessarily want it to be. Believe me, we're very anxious to hear what you'll think about the work we did. Also, I think it's likely we'll release single player before multiplayer because we still need to get some lobby systems in place. /swen