Beyond acting as a demonstration of how a first-person shooter works in VR, it's a pretty strong warning that ports of existing games don't necessarily take advantage of the Rift's strengths.
Yes, you'll need a 3D printer and a knack for programming to get most of these projects going, but you won't have to wait for someone to make them for you -- a big help when many ready-made VR displays are either in development or priced out of reach for the average person.