Thank you for the compliment! I'm hoping to spend more time expanding on the gestures and giving more purpose to the elements. I feel spatial audio is of huge importance in VR. I wanted to emphasize it further by having the audio represent the elements you can "harmonize with" (air, fire, and life in addition to the water you start by).
VR is definitely going through a transition period in both Unity and Unreal. In the case of Unity, the OpenVR / SteamVR plugin is what I used and provides the red gloves. It has been deprecated in favor of another system, however that system does not yet support the Vive or the Index. Unfortunately the OpenVR plugin I used was not intuitive and I made errors in the build that necessitated the hotfix I released. I do not believe my game works with WMR, however I don't yet have a WMR device to test with.