Feed Reader UI Review

It is my hope that this is the most appropriate place to ask for a quick look at a UI that I designed for a Feed Reader application. I considered CodeReview, however I'm not seeking a review of my code (it's not very readable at this point) but a UI usability one, so I figured I'd ask here.

I would like to know whether there is anything obviously wrong with any part of that design. There are subtle differences on mobile resolution and on a desktop one (such as drag & drop like/dislike instead of a "+/-" badge or highlighting items by long-press on them rather than CTRL+clicking). I tried to incorporate best of both words into the UI, so it's usable across Desktops, tablets and mobile devices.

The URL to a prototype UI is http://martinambrus.com/feed_reader/interface.html

Thanks for any suggestions / advice.