This is really well done. It sounds like you had this properly mastered prior to release. Well done dude.

The horn parts work well, but the playing wobbles a tad, in my opinion. I'm no horn player, but I wonder if playing it more assertively and then putting it lower in the mix to compensate might work better?

The fade-out of the brass instrument works okay, but the bit before sounds a bit chaotic, at least within the context of a four-minute pop song. I'd try to sharpen up the ending, go for something cleaner and more decisive.

Like the backing vocal. Very Wailers.

Good use of space. Avoids overcrowding the arrangement, letting the groove and vocal take precedence.

The bass line is terrific.

Cool opening.