Nice app! Couple suggestions...
1. tapping on the article takes you to the HN comment thread. I prefer to read the actual linked article before commenting, so maybe that would be preferred? A comment count bubble to link to the comment thread would work, leaving the tap on the article to take you to the actual submitted article.
2. Not being able to swipe to go back is something I instantly missed having. The tap at the top left to go back to the big list is a long way up there on a 6S or 6S+ and swipe to go back a page is a nice option.
Otherwise, looks great! Nice, clean interface and very fast.
My Octocat by Github
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hn.