Great

A great sequel, improved in many ways and true to the spirit of its predecessor.

A little bit more story but again I didn't really get that into it.  Some additional interesting mechanics, a second character in some puzzles, and very cool graphics.  Again one level with trippy upside-down walking but it was a bit more understandable to my eyes.

The game says to make sure you have the sound on in the beginning and it is right, the sound design is amazing.

Great puzzles with flawless gradual building of skills.  I never had to look outside of the game for help (The Witness comes to mind) nor use an in game hintsystem (none exists) a la The Room.  The only ridiculous level design was level six in the Forgotten Shores DLC where I found it difficult to visualize a continuous plane in some circumstances where the character is walking upside down.  But the solution was decipherable anyways so I didn't spend much time trying to convince my eyes to see something.

Story...can't say I paid much attention to it.  I guess some "ancient beings" or something left the puzzles as monuments.  Whatever.  It is not crappy and stays out of the way.

I played the original game, DLC levels, and the Ida's Adventure standalone part.