This was a clever idea! I haven't heard many "chant" remixes, and the way you mixed it with BBBFF was pretty cool. I can't offer much in the realm of feedback unfortunately, since I'm not very experienced, but I thought I'd let you know I liked this concept. May I ask what DAW you use? I'm curious.
At the part where the vocals were all "when I was just a filly i thought it rather silly", the beat thingy doesn't match the tone or emotion. Might want to change the chords and scales at those parts to match. (for next time at least)