It's nice to see what is essentially an escape game turned into something with a story. I didn't play the first part so I didn't really have any context. The puzzles were more interesting than what I'm accustomed to in this kind of game. It's usually just "click on everything until you find a key, keys keys keys more keys, and make sure you look at the clock because the time shown on it is actually the combination to the lock, etc."
This was very reminiscent of Myst in that regard.
The lighter action event was a little weird. I appreciate the work (and resulting variety) that went into adding it, and it made the story more interesting than just walking through a door, but since it was the only time-sensitive action "puzzle" in the whole game it felt out of place.
People who are having problems with the Book puzzle: I'm not going to spell it out for you but I'm going to give you a fat hint: There are 26 symbols in the book, and there are 26 letters in the alphabet. Are you ready? Here comes another hint: The symbols in the book aren't printed in alphabetical order.
To be fair, one of the planets isn't spelled the way most of us are used to spelling it, but it's still possible to solve the puzzle.