Why wouldn’t you match the colors for the functional areas to the colors of the app itself on the iPhone? For instance, why are Podcasts the color red instead of purple? (the actual color of the app)

Your filtered search breaks Apple HIG. Put the filters at the top and the search results below it. It makes much more sense.

Horizontal scrolling sucks. Both Apple and you should get rid of it.

One of your screen shots is using the wrong style of down arrow next to the Apple Music menu on the left. Might want to update that for consistency.

You separator lines get lost in darkmode. Might want to think about adding a 1px highlight to them to make them stick out.

Why is there an icon for “album view” next to the heart button and play controls? Seems like a really odd placement. Usually you group icons together that share similar functionality.

The alignment of the play scrubber is a tad odd. The numbers on the right of the scrubber line up under the heart icon instead of stopping at the end of the song name display container. And I find it odd that the scrubber extends to the right further than the name of the song. I think there was a good reason Apple had it centered in the middle. It’s more visually balanced and pleasing to the eye.

You have a giant space reserved for the color menu and yet the text is still really small. I would take this as an opportunity to create a visual hierarchy with the text by making it larger than the body text.