Kasts in itself is a great application, thank you very much for the development efforts you have put into making this application.

If you follow many different podcasts it becomes quite a bit overwhelming to keep track just by name.
It would be great if it was possible to group podcasts either by tags and/or sort them into folders. Creating specifically named Playlists would alternatively also be an alternative to organizing the podcasts.

As in folders: Maybe on the subscriptions page you could be able to make folders to sort/categorize your podcasts. Or add a new page "Categories" to the left side bar (which might be the better choice). Also would be nice to be able to play all casts from that folder/assigned category - as in "add to que".

As in tagging: On the left sidebar you could add "Tagged" and you could assign keywords to podcasts therein (or the keywords could be generated/fetched from the types/categories of the podcasts themselves).

Or alternatively a section "Playlists" on the left sidebar where you can add your subscribed channels to custom named playlists (functioning essentially similarly to the folders above). 

My best regards to the development team.