So I've been using the Ibox Tv android app on an Android TV box.
It works okay for the most part.
On the guide page, the previous day and next day buttons aren't selectable.
The only way to go back to 3 days ago is to hold down left and go through all listings between today and 3 days ago.
Is that by design?

Also, you should add android tv leanback support to your android tv app.
This will allow it to show up in the default android tv home screen.
Sample guide 
I used App Cloner to clone the app as a leanback enabled app so it could show up without using an additional home screen launcher.