I just published my first app here and I was able to get tons of feedback from the members of this forum, and since this is your first app, I would also like to return the favour that others gave to me.
Okay, enough pleasantries.
I downloaded and installed your app
I really like the clean interface, but I did have a couple of bugs.
When I first opened the app, a dialog opened stating that I don't have any lists and if I would like to create one. I then created a new list and the prompt came up again even though I already created a new list.
After adding items to the list, I clicked on them to mark the as read, (the read items were really difficult fr me to see though, almost the same colour as the background)
I tried then marking them as unread by long clicking...all except the last reverted to an unread state. I tried a couple of times, but it was still "grayed" out.
I hope this helps a bit and keep at it.
Since I have more posts than you I can post links (its below so others can go directly to it)