There's haptic feedback for most of the actions(I always wanted to try implementing it and it was surprisingly easy).
Other than that, pretty standard implementation of a CollectionView with some networking. If I were to add stuff to it, I'd probably add a error alerts for if things failed to download, and perhaps a user flow if something didn't load in.
This project uses Cartography to condense the layout code. I've found in the past, that while Autolayout is definitely the way to implement UI, both storyboards/XIBs and programatically creating constraints are either unwieldy or unneccessaryily introduce complexity. Cartography is a library which condenses the Constraint API and makes it much easier to write, and in my opinion, read.