I agree with bartavelle that the ending frame is a bit unclear. I had to play around with a few online bowling score apps to figure out how it works (and they weren't all consistent!).
This is exactly what test cases are for.

Wow, that one bent my mind a lot...
I'm still not sure I have it down completely, but I feel like I've leared a lot about type-level fixed points.

Nice excercise!

Definitely needs more test case examples.
This kata is all about the corner cases.
Nice excercise though, it's deceptively hard!