Michelle,
I can't listen on this workstation but I wanted to make a comment about the hook. A couple of things came to mind. The first one was that this is the title of the Eagles hit of a few years ago. I don't think that is a problem but as I read the lyrics, I was wondering why you chose it because you are developing an idea with a puzzle as a metaphor. The working ideas are that a heart can be broken, that a broken heart has pieces and that like a jigsaw puzzle, you are attempting to put them back together. That all is working quite well but "get over it" doesn't apply directly to a puzzle. You even say, "Like a jigsaw puzzle, piece by piece
I wanna, I wanna, I wanna, I wanna get over it, I'm gonna get over it". The metaphor is breaking down at that point because a puzzle is not something you want to get "over". You may say that you want to "finish" it or even "get it over with". Now when I listen to the song, it may make more sense to me but for now, the hook is taking me away from the rest of the lyrics. If I was asked what I thought the title might be, I would probably say somethink like, "Missing pieces".