To go with what a lot of people in here are saying about marketing being a very important aspect, and also point out for Indies it's continual marketing that's important. Indies don't always sell well right away you kind of got to keep pushing at it. Heck the game came out what a week and a half ago? They're already thrown in the towel?
Although, after watching the trailer I'm not sure how unique this game really was. Certainly looks like a couple dozen other games I've seen come out in the last few years.