I beat Factory just now :) And I still feel like I've not seen all the secrets.
Question, is there an option to turn off the music?
:D
That happens to me when I'm overly tired, and it can happen with any music heard any time during the past day(s) (e.g. the jingle of a commercial). When it comes to games, I can't remember if it ever happened, even when playing demanding games for hours (for example, Last Ninja 2) - but it's ages since I actually did that, so I might be misremembering.