This is a very highly polished portal experience. The puzzles are mostly pretty easy but not totally trivial. The plot is fine if not up to the hilarious high standards the portal games set.
My main criticism is that there is a lot of walking around aimlessly through environments between puzzles. Obviously they put a lot of time and effort into those environments but they added 0 to the fun of the game and just padded the game time. There were even several times when it wasn't obvious where to go next that I spent fumbling about just lost not even in a puzzle not even using my portal gun.
I also have one minor quibble about the last few puzzles that I won't elaborate on so as to avoid spoilers, but suffice it to say I had to redo parts of that puzzle that I had already solved many more times than any other puzzle before it.
My main criticism is that there is a lot of walking around aimlessly through environments between puzzles. Obviously they put a lot of time and effort into those environments but they added 0 to the fun of the game and just padded the game time. There were even several times when it wasn't obvious where to go next that I spent fumbling about just lost not even in a puzzle not even using my portal gun.
I also have one minor quibble about the last few puzzles that I won't elaborate on so as to avoid spoilers, but suffice it to say I had to redo parts of that puzzle that I had already solved many more times than any other puzzle before it.