So is this game finally completed? The harem end is totally finished? Girls who was planned to have sence like Aya won't have it now?
Not necessarily.
The game was completed some time ago, but TK can't seem to stop adding new content. In this thread back in October he said there would be a small update adding the Harem, and then one more after that at which point it would be completely finished. But he has also said similar things in the past.
Recently on discord he said that there may be more girls added to the harem depending on how much fun he had doing it, and he listed several others that have incomplete stories that he wants to finish. The great thing about the structure of Solvalley is that it is so open ended that adding new content doesn't break anything and could conceivably never end.