I thought the ending was masterful. I hate cliff-hangers, and it didn't end in one. On the other hand, there were some tantalisingly loose ends to lure me into reading more of the story.
Like Nerds of a Feather, I did initially wonder why the protagonist was male. On reflection, it made sense. I don't see a shortage of female protagonists in space opera, but I can't think of many female antagonists. I think the combination of male protagonist and female antagonist worked better than either female protagonist-female antagonist or female protagonist-male antagonist.
Oooh, good, I'm glad it left some tasters for book two.
Actually, @Bowler1 picked up as a beta that I may have chosen the wrong twin,and I thought long and hard about it. Originally, Kare came into creation when I was 16 and having a tough time and was a bit of a protector, and, being a straight female obsessed with pop stars and crushes and what not, it was probably logical the character should be male.
When challenged by Bowler, though, I went off and had a muse. I wasn't against changing it per se (although would have found it hard to give up a character I was so close to and enjoy writing so much.) also, some of the darker stuff would have had a different timbre on a female, (to do with perceptions of trope and what's okay to happen to each sex*) but since I'm hitting it from the psychological angle that would have been surmountable, I think.
Eventually, though, he stayed a bloke because the premise of the trilogy is to take the chosen one trope and make it real. I'm not sure if what happens to Kare is wildly outre for a chosen one - hard childhood, fighting for their position through many travails, getting hurt in some way, having an antagonist to overcome, and failing along the way etc etc, although I did go to the extreme edge of it. It's very dark because I choose to be inside that chosen one's head and for him to be a fairly likeable, down to Earth (well, as much as he can be) bloke. And, frankly, most chosen ones in sff are men. So, I kept him as a bloke because I felt using Karia would mean that I was no longer trying to ask the questions I wanted to about the trope (should we be so casual in our portrayal) but a different one (should our chosen one always be a bloke.)
I hope that makes sense?
*
Although, since I had my male character raped, a fate usually portrayed against female characters, I'm not sure it would have changed what happened. What might have made a difference was what the ordeal set out to do, and only research would have made me decide. By that, I mean that research told me if you wanted to remove power from a man and leave the legacy I have with Kare, the poor chap, rape is a widely-applied trauma, as is the sort of torture shown - an insistent, applied, mix of pyschological and physical. I'm not sure whether that same approach holds towards a female - and glad I didn't have to do that research....