I like the look and feel. Nice job. I used the example feed, and four post titles were retrieved, but I was not able to open the post by clicking on the title. Chrome on Android.
Did you perhaps not really add the feed? Like, it shows you a preview where you only see the titles first, and then you have to click "Add feed" at the top. It's just a step for you to be sure that you got what you want; but I guess it isn't 100% clear.