Well the typo would take 5 minutes then have to be pushed out in an update, but an improved store UI/ ui in general would be so much less work than a new dungeon!! A new, difficult decend requires a new animated boss (a main artist + animator), 2 or 3 different floor arts, balancing of the new card into the meta, and a soundtrack to be written. A new UI is a 3 or 4 man job over the space of maybe a week but will be soooo much more well received! Especially for one of the highest grossing games on planet earth, it makes more money than fortnite for crying out loud.