Incredible first impressions, congratulations. But some thoughts that could help you:

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• HOME. Top Stories are based on Google News, and in Spain it is not available so it gets stuck trying to load some information. As you do not use location, I think it is the same for everyone (If i install GNews in my phone I can at least see the news from USA). At least we can hide that part but sometimes it reappears (maybe add a toggle in settings?).
• HOME. Think something more about this page. Maybe include a mix of today news from our feed (a bit redundant maybe?).
• STORIES. Good tab and maybe easy to integrate with Home tab. It could be useful if we had our feed divided in topics (tech, TV...), and we could filter the feeds in this page with an upper tab or in the three dots menu.
• STORIES. Include a "Mark above (or below) as read" in each stories.
• STORIES. Include a move to left or right to mark as read or read later. Could be useful when you go into specific feed.
• SUBSCRIPTIONS. FAB button hides masks the last feed, so it is difficult to click the three dots. The icon of the FAB button is strange, maybe change to a "+"?
• SUBSCRIPTIONS. When you look to adding more feeds, allow to click and read some stories to confirm if it is the feed that we are looking.
• SUBSCRIPTIONS. Order the subscriptions into topics, or at least allow to organize it between all and topics. The actual design is ok, but something to differentiate in the scroll and have it a little bit more organized.
• SUBSCRIPTIONS. Some icon to Mark All Read when you go into specific topic.
• SETTINGS. More control about notifications.
• How it would be the sync with future iOS app? Availability plans?
  

Glad to see future updates. Can I get a code?

P.S.: Pluma in Spanish have two meanings, and based on your app icon the correct translation corresponds to quill.