Difficult to say as to what might be going wrong. Your SteamVR version is up to date, right?
If you can wait, I'll be releasing an update in a few weeks. Perhaps that will fix it (or not).
Everything up to date, all games are clear except yours :(
Steam VR reports I'm rendering at around 2000x2000 pixels in your game, but it looks like 300x300
Do you mind joining the game discord channel for a bit? There's a log file for the game, if you send that over it might help narrow things down.
