Regardless of it's shortness, it's a good game with surprising humor.
I just beat portal... yeah.. I know. Regardless, it was a great game. I've played some portal 2 so I had the idea of how the challenges went.
The game was short, good and bad in my opinion. There could have been a lot more content to the game, but it wasn't really designed for that, was it. It seemed to just be a joke of a game put in, but it turned out to be something really good.
The game's puzzles weren't terribly hard... nothing compared to portal 2. I honestly Thought that portal 2 was much better... albeit I've only played the multiplayer on Portal 2.
I don't have much to say about the game really. It's a solid game that will take up 1-4 hours of your life... depending on how quickly you figure out the puzzles.
The game also has surprisingly good graphics.
Overall the game gets an 8.5 from me because it could have been better but it was a great game.