Oculus store and Steam store both have Orbus. If you click play normally on steam version it will be basically the oculus version in terms of hand position, controls, etc. However if you go into launch options you can type
-vrmode openvr
and what that will do is tells steam and the game to launch the game in openvr. The vr type that the vive uses. It is also named SteamVR. And you are then on a Vive version with the game thinking you are playing on a Vive.
Though you could just be asking how to not play through steam. There is an Oculus store to buy Orbus from and the game launch stuff I said previously.