That was lovely! The challenges were difficult, but not overly so, and the music and atmosphere were both very nice. I noticed the screen would occasionally shake a bit after a transition, but I almost feel like that just added to the ambiance of being in a cave. I got 13 on my first run. Time to see if I can grab those last two!
Edit: I just got them! I have to admit I'm pretty bad at the trick from the end, but I think I'll get it with a bit of practice.