About the setback.
The interaction system for the game was built on VRTK. The VRTK project unfortunately stopped supporting VIVE systems last year. VRTK may become functional again some day. But I can’t have such a large set of code residing in the middle layer of my project, if I can not trust in the code being stable. So I have had to scratch most of the old code, and start anew.

Lucky for me, Valve and Vive have respectively upped their game, so to speak. The new code for interfacing with VR, not just for the VIVE, but for the whole range of the SteamVR regime, is much better to work with. I hope to be quick about it. The release date may change again.