Zapin :
This is not a Rift exclusive as such. The developer has stated that they expect Vive support to come later but give no information about when that will be. There is no contractual obligation to Facebook tying it to the Oculus store or hardware. The Rift will get real VR controllers sometime in the next 6 months, so perhaps they will coincide a Vive release with some sort of Rift touch controller update.
Understand, But you can play any Rift game with the Vive as is (compatibility wise) just with the use of a "Mod" so it begs the question as to why not a duel release with touch controller support to come? I believe this is an Exclusive, and I understand why. They have said they are selling the rift at cost (whether I believe this is another topic) so their sole source of income comes from selling titles in the rift store.