One thing you should definitely fix - once you install Android app and run it for first time, it tells you that you need to sign in using your G account. I thought the reference is for the web-app since the android app already listed my G account email address at the bottom of the screen. In the web-app I checked I am signed in and yet I could not do any push. So I was frustrated why the wep-app does not recognize my android device. I touching the android app randomly and finally a random click on my email address made the connection.
Its definitely not obvious how to pair the device with the web app. You should make some button in the app
Otherwise I like it :)