First, I noticed that the app did not specify how many selections it would take to be able to move forward. Keeping the same functionality, I added a number of selections to let the user know how many they need to move forward. The app needs a certain amount of topics to propagate the feed with enough information.
Next, I changed the look of a selected item because a color indicator by itsself may lead to confusion if the user takes their eyes off the screen for some reason and looks at it again.
On the third screen, I added a back button because users naturally want to go back and select more or different topics.
Lastly, I changed the feed page title to just 'Feed". This is to make sure it's known that they are on the feed page and not confuse them with too many words.