Selfoss is great, but I have some suggestions may make it better:

1 Expand only one article in page, when click an other title, shrink the opened one (like google reader).

So that you don't have to scroll very long distance to find something on top, or click again to keep the page clean.

2 Add option whether to automatically load image on mobile (narrow) screen in config.ini(maybe). (If you on wifi, tap "load image" in every single page is painful.)

3 Consider move the "close" button on mobile screen to the top left, most people use their left hand to navigate, like iPhone put the 'Back' button on top left, I think that would be good.

Good job!