I am not what you would consider a gamer. I like to play 20 minutes at a time, casually, every few days to pass the time. This game, however, changed all that. As soon as I started playing, I was hooked. I played it for 6 hours and completed it in one day.

The puzzles are brilliant, the control is as smooth as intuitive as it can be, the game world sucks you in, doesn't waste your time, doesn't go into deep cutscenes that nobody cares about, doesn't have a plot.
It's just solid gold gameplay that has you thinking outside the box at times, challenging you at every turn with brilliant game design.
The polish is surprising, this game knows exactly what it wants to be and executes it to perfection.

Some reviewers treated its "short" length as a downside, I think it's a huge plus. I hate games that take too much of your time. If it's gonna be this good and this addictive, I like it that it can end in 15 hours or less. I really wish they made more games like this.