Just to catch you up quick, Meteorfall is an awesome solo deck-building card game which mashes together roguelike, RPG, and Tinder-style mechanics. You'll pick one of four adventurers and play through the game with their skills and abilities.
As I've said before, this new update is a biggie and focusses mainly on the new 'Demon' level of difficulty. After you've defeated the Uberlich, this difficulty level unlocks and you can continue making things harder and harder with every level you beat thereafter.
You've also got five new demonic enemies, 18 new cards, two more events, and a ton of balances. There's a lot been fine-tuned, so check out the full patch notes right here for more detail.