I think this is best launch title for Vive (don't know if this is coming for Rift). It seems that this game was created by 1 person within 8 months (D&D fan). Imagine AAA studio working on it and how this would look like/work (Skyrim graphics I guess). It seems that BLINK transportation mixed with Roomscale fight mechanics works. Fight mechanics seems to be great : monsters adapt to fighting style, learn and as effect you have to adapt and execute smart strategies. (if you just try to use elbow enemy will eventually block all arrows with shield so you have to mix strategies).
I also found someone playing this just sitting so I guesss it may be ported to Rift eventually but not sure.