I think the Ljosalfar are pretty strong. Wether or not they are more powerful than the Hippus (when they get raiders), the Luchuirp (when they get barnaxus) or the Calabim I don't know.
But I think they are in a reasonable place. The only change I am consdiering for them would be to tune Gilden down a bit (or move him to a later tech). But even that is pretty minor.
Im pretty happy with the Ljosalfar and more interested in making the other civs more like them rather than making them more like the other civs. And don't take me to literally, when I say "make other civs more like them" I dont mean that I want a civ that gets more bonus's from mountains, one that has it with jungles, etc etc. I mean that I want the civs to have unique flavor and mechanics that gives them effective options that other civs dont have access to.