Overall, liftoff has a pretty decent amount of customization. Posts can be full cards, compact, or compact without thumbnails. A full width image is shown if the post is expanded.

Font size for the header, title, and body are separately adjustable. The ‘action bar’ (share, reply, vote, etc) does not appear to be resizable.

I was unable to find a way to browse a list of subscribed communities, which I generally find useful.

This definitely seems like a good start, I’ll definitely be following development.