Thanks. Well, I started the game by going up there. I activated the tower and went on top when it was still transparent. I found the rocket by using the telescope up there. Then I went to the rocket, found the "bug" then I found the entrance inside the mountain, then went on the moon and back, then discoverd all other different places of the "island" with the five scupltures (while in black and white).
The last hour I went back everywhere I alredy visited to see if there was anything new. I spend a lot of time in the cubes room. I didn't find anything there...
Well, when I say I looked at each star, I mean by that I zoomed at each. Actually I scanned the whole scene and each time there was a detail, I zoomed on it. Of course I may have missed something, but it's quite hard if I don't know what I'm searching. Not sure I will go back. That's not really a fun part of the game.