Looks nice! Have been using another client till now. One question though. Why do I have to enter my credentials directly in the app? The app I'm using now uses kind of an OAuth flow which makes me feel better somehow.
HNBuddy interacts with the HN website through a web scraper that is open source [1]. Though, as discussed in another comment, I can't really give you any proof that the code of this scraper is the actual code built in the app.
Anyway, if you don't trust me, you can still use the app as a simple reader :)