I always find SFX a tricky thing to balance, there's such a fine line between adding immersion and risking being annoying isn't there! And worse when you test yourself you have no idea if you've become numb to it. I heard the song in my game so many damn times during testing it was in my brain when I tried to sleep haha.
Your game is definitely one of the more memorable ones I've played so good luck for the next jam you enter, I'm sure you'll do great! :)