Looks really clean.I built something similar http://newsofworld.org. It's not an app but a real time responsive site.Click on category , country etc. and you'll get news as it comes in.
elixircasts.io is a very good resource for anybody starting out with Elixir/Phoenix.Elixir is an absolute joy to code.I wrote http://newsofworld.org entirely in Elixir/Phoenix.