WOW. Great game... one of the best I've played in my 40 plus years.
First of all, it is such an impressive feat of VG writing.
Secondly, I loved how the games were hard enough to make you learn, make you try, but easy enough to never frustrate me. In each instance, the game made me pay attention to the joy involved in learning a mechanic, and identifying when to use it.
I would compare the overall experience as a player as similar to that I got from ...maybe a LucasArts adventure? But I want to point out that this game is never anything less than something VERY original, unique and fresh.
I can't give you much more praise than that.