IMO, it's pretty good. I've really only got two criticisms. I don't like the active component of combat in my turn based games, but that's pretty minor. My bigger gripe is that I think the last act of the story sucks.
I was so strong at this point that boss mechanics were purely optional to me, I was capable of one shotting everything.
Also a lot of the human characters do things that made me dislike them in the final act.
FYI Android is not about to become closed source. Google has their own internal dev branch and the publicly available main AOSP branch, this is already known. What they're doing is simplifying their release process so that rather than having two "main" branches AOSP will be downstream from their dev branch.