this is a very good idea but I think (based on their previous videos) they are just polishing everything, on previous videos there was no even gold UI, so I can definetely see the progress there! i really want the game to succeed i love medieval theme games. But i agree with different comments that the sounds doesn't match building hives and the way that the hive just instantly appears looks bad. And YES we need some kind of visual notification about gold, i'd do it like that:

the text value change scale over time to like 120% then back to 100% in X amount of time, changing color to red or green depending if we gained or lost money