This is by far the BEST skin I've ever had! Especially Woob's 'Ueh' whenever I miss a note, makes my ears melt. Anyway, good job on this one.
The only issues I encountered with your skin was that there wasn't a meter for the spinner, and Ruby's spinner sprite blocks the score you get from said spinner. I suggest you move her sprite to the left or right, your choice.
Here's the solution for the spinner meter:
1. Copy spinner-background (be sure to copy two of the file).
2. Name the two files spinner-metre and spinner-metre@2x.
3. Enjoy your spinner!