Thanks for feedback!

I personally think that 0° and 90° CCW orientations are enough You are free to not agree with me.
Anyway rotate buttion shouldn't toggle all four orientations. Every user will have his two favorite orientations and the button should toggle between them. Which two to use might be customized in settings.

I think forward/backward buttons should switch tracks on short tap and do fast forward/reverse on long tap.

lma, yes, seekbar's hot area now has the same height as round glowing and overlaps bottom part of the list and upper part of the toolbar. I'm not sure how to solve this. May be make non-rectangular hot area — wide around current position indicator and narrow elsewhere.