Well, after the last terrible puzzle game I played (see Hamilton's Great Adventure Review) this game was actually pretty good.
On the surface this game looks like a cheap Portal knock-off, however that's not the case.
It had some unique idea's, puzzles that haven't been done on Portal or attempted by Valve, so it's not just pick up this cube, put in on the button etc. (I still enjoy Portal).
Whilst the game does indeed borrow from Portal. With the White 'Tiles' or qubes and obviously the 'testing' the game is pretty enjoyable. Towards the end the puzzles get slightly difficult. There is a quick retry button which is appreciated greatly.
There were a few problems with the game however, unfortunatly the game isn't quite as polished as Valve's Portal series. There were a few times where blocks imploded or just randomnly dissapeared. (That was my fault though, I was purposefully trying to break the game).
The story is fairly short (if you can call it a story). The game lasted me about 3 hours and there isn't any narration or indication where you are or why you are doing what you are doing. Then's no voice over/narrator/sentient AI.
The ending to the game was pretty laughable.
However I bought the game whilst it was on Sale with the dlc in a bundle, for about £4 possibly. Wouldn't recommend the game at full price by itself. I have yet to play the dlc but I'm led to believe that it will push my overall time up to about 15 hours, thereabouts.
Overall, It's a good interesting game with unique idea's that I haven't seen in any other puzzle game, the main game is short and there is little to no story and they physics can be kind of off at points, however if Valve worked with or employed etc them for puzzles for some sort of Portal 3 with the imagination that the makers of Qube had, it could be something pretty special.