Finished it yesterday, twas' quite epic.
I really love the physics and the art style. Brings back some memories from the original Portal game. The voice acting is amazing in this, especially Wheatley's voice actor, Stephan Merchant. The humor within Portal is very funny as well.
The levels/chambers were very well made throughout the entire game, there were also lots of secrets! The ending was perfect for Portal 2, and the credits, oh my, the CREDITS WERE AWESOME!
Would play again.