Unity needs to see a HMD (head mounted display) connected to enable
VR mode, unless VRStreamer actually simulates a headset it's not going
to work.
I use RiftCat and it has options to emulate a Rift and SteamVR. If VRStreamer has an option to do SteamVR, you might be able to run Yiffalicious through Steam and get it to work that way.
Problem is Vridge (Riftcat) refuses to let me install it on my phone because it's an S4. And when I installed it manually from an APK, it crashed on startup. VRStreamer doesn't appear to have SteamVR support though.
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I use RiftCat and it has options to emulate a Rift and SteamVR. If VRStreamer has an option to do SteamVR, you might be able to run Yiffalicious through Steam and get it to work that way.
VRStreamer doesn't appear to have SteamVR support though.