This game is IMMERSIVE. You are transported to a world that you will wish that you lived in. I have the soundtrack by Robin Miller, and listen to it often while I'm working, and I have loaded the game many times, and just left it running in the background, just as a pleasant escape.
I actually cheated to get through some of the puzzles. I didn't care, I just wanted to see the world they created. Just being there is worth the price of admission, it is so beautiful.
Do yourself a favor and get it. It's that good. Best game of all time? Yes, I think so.