A fun and interesting take on the theme. I do like a good "Game inside a game" meta thing.
It wasn't till my second try that I realized there is no point in watching who goes to the counter to pay for their stuff, the game got easier when you just focus on any shrinking icons, otherwise I think I would have been overwhelmed.
Things got slightly choppy on the last level when there were a lot of shoppers, not sure if that's me or it just being web build shenanigans.
Nice work.