This is really awesome. I think I played with your source a few years ago, trying to adapt it to work with Google Cardboard. My initial attempt failed, because my eyes would lose focus during each word transition. I decided I'd need to add a lightly textured background, which would be shown all the time, and which would fix the distance my eyes were focusing, and then lay the text on top of that. IIRC I gave up because I realised the 'right' way to do this was to use the Cardboard SDK, but that would mean also writing something to render the text into pixels (as the SDK only supported graphics).

BTW - The Google Play link in the repo doesn't work for me, and I don't see Glance in F-Droid. What's the easiest way for non-developers to get the APK?