I think the manual isn't changed since 2010?
Now, few images are outdated...
...there is a page what is "empty"...
...and the Sky Maker's page is missing the menu.
It's should get an update, and that would be a good idea to answer the most common questions there (for example):
-How to install (both for MS Windows, Linus, Mac)
-How to play the game
-How to Change Username, Email (etc): Basically the usage of the user panel
That's all...
Thanks for reading!