That is good to hear, because I'm well into development now and opted for a purely gaze-driven control system!
I thought I had read earlier that the GAJ wouldn't be accepting games using controllers, is that right? This might be a concern for the arcade controls you've mentioned.
I thankfully have obtained a non-Google Dodo Case (cardboard-like) headset and a more robust VR One plastic, strapped headset from a friend to develop with. While the comfort of the VR One is unquestionably a better experience, I've also observed that the field of view differs between them, and suppose I need to consider this into my game's viewport.