No worries - catching all bugs, even severe ones, in projects with a time limit and without an army of testers (preferrably on all kinds of platforms) is almost impossible.
Was just able to reproduce it again - cursor was visible, music continued to play, buttons did not react to clicks. What are you using to create the game? If it's Godot by chance, I encountered issues with buttons not being clickable frequently while developing my own game - ended up having to nest them in their own CanvasLayer, so they register properly.
EDIT: Oops, nvm, this is clearly Unity, unfortunately, I know nothing there.