Ooh, first commenter, how often does that happen?
This one was okay. I thought she had an interesting situation being the Kingspeaker, though the arrogance of the monarchy annoys me that this person is supposedly so higher above regular people that his voice can't be allowed to be heard--obviously that's not a flaw of this story since it's a reflection of a typical monarchy.
But I wish there had been some fantasy element. Other than made up countries and the (I think) made up occupation of the protagonist. I'm not saying that everything here has to have magic, but I'm just personally more likely to get into it if it has some kind of supernatural element.
And I couldn't help thinking about all the ways a less scrupulous kingspeaker could abuse her role. Slip the king a little something to make him ill, speak for his request to be isolated in his bedroom only seeing his kingspeaker, and the king withers away while the kingspeaker makes all his decisions for him using his voice. Not that that's a flaw in the story either, it's just that I doubt that every kingspeaker would be as responsible with her power as this one. Some details reminded me of Brandon Sanderson's Warbreaker, but not in any bad way.
So, all of my comments boil down to that I didn't find anything objectively bad about the story, it just wasn't suited to my tastes.