Sorry OP, but autopilot or pilot error, it looks to me like it didn't have much time to spin up the props to full throttle and as a result it pitched forward.
I've seen it happen and done it myself with other quads. I personaly think the craft did exactly what was required of it.
Why would you use an auto takeoff feature in the first place? Let alone 30 feet from the front of your house?
Was this a first-time flight?