I loved the flavor of the popups in this! The OS recreation was really cute too.
Here's my two cents: If you wanted to iterate on this game, maybe you could add different types of pop-ups that require different types of interactions to close?
For example, different "x" placements, moving ads, captchas, or a window that requires that you slide a bar to close out. In other words, you make all the pop-ups into tiny minigames, which would shift the game into more of a WarioWare-type minigame barrage. I think that might be a cool take on that genre!