exokit
https://github.com/webmixedreality/exokit Not a game but a work in progress "browser" that can run some WebVR apps already.
Building is easy (hopefully no errors):
git clone https://github.com/webmixedreality/exokit.git
cd exokit
npm install
Running is currently a bit more complex because it's missing linking several libraries, you can just preload them:
LD_PRELOAD=/usr/lib/libexpat.so:/usr/lib/libXcursor.so:/usr/lib/libXinerama.so:/usr/lib/libXxf86vm.so:/usr/lib/libXrandr.so:/usr/lib/libXi.so:/usr/lib/libasound.so node index.js
If it loads, go for example to apainter:
.go https://aframe.io/a-painter
It should open a window and automatically use OpenVR/SteamVR.