Really liking the app so far. Great work everyone involved.
As for feedback, I agree with those mentioning a night mode / dark mode setting. Especially for reading articles at night, this would help a lot.
Another thing I noticed, although this is nitpicking a bit - when scrolling through an article, the black bar at the top with the back button is quite big, and since it contrasts with the article, it distracts from it a bit and limits the space for the article.
Ideally, the app would handle this how Google Chrome handles its address bar on a phone - when you scroll down a page, the bar hides so that you have the full page taken up with content. When you scroll back up a bit, the bar reappears. Alternatively, when an article is first loaded at the moment, the bar is transparent - if it stayed like that, it wouldn't distract as much as it does currently.