I know you can develop games for the Oculus Rift using Unity, and it looks like the same method works for Vive as well. It looks like there's ways to integrate Unity3D with Haxe (https://waneck.github.io/wwx-unity3d-haxe/#/
), the current cross-platform toolkit Fizzer uses to develop Warlight.
Probably the most intensive part would be 3D modeling. I think it'd also be cooler as an AR game than as a VR game, and it looks like you can use Unity for that too (for HoloLens).
Only issue would be gameplay- I don't think it'd be as efficient in VR as it is on PC right now (should still match mobile, though). I know that, historically, Fizzer has been quick to reach out to some new platforms to promote the game- Warlight used to be one of the few games with a Google Hangouts app- so maybe you could persuade him to target VR.
Edited 7/5/2016 20:06:23