I haven't gotten right into it and explored recently but from what I understand they are still building the island... I think? The top half was veeeeeery unfinished when I last tried it. I'm not sure how much is left to be added to the game, the one thing I did notice is that it is running much smoother now than it was last year. I don't think you can finish the game yet "and yes the objective is find your son" although I am not completely sure.. I haven't been following development in detail. It's certainly a fun game, although it might be better to wait until development is finished. I think the reason they added multiplayer so early on was to keep people interested in development.