I bought this game because of good reviews and its "special" style and I have to admit I wasn't disappointed.
You're running around as a little boy, who stranded somewhere he doesn't know (and you don't know either) and soon notices that the place is as dangerous as it seems. The plot gets clearer after some time but the ending was a bit unusual because you really have to think and look for details to understand. And there's also room for interpretation so everyone will probably have seen a slightly different ending. ;)
In the game you are solving physics puzzles using gravity, inertia and your dexterity. In the end, puzzles get more difficult, but never unfair, and mistakes will be punished with death all the time. And you will die very often in a bloody way (trust me ;) but fortunately, you'll respawn in the last save place mostly only some steps before you died.
It was very impressive for me how they could create such an atmospheric game using only black, white and everything between and no music at all. You hear just noise of the environment. If there is a doubt that video games can be art, it is removed by this game, for example.
The reason for me only giving 4 out of 5 stars is that the game is quite short, the story should have be told more detailed, and the end is a matter of taste. But the latter is typical for art, isn't it?
I recommend everyone who hasn't played that game before, doesn't hate jump'n'runs, and likes to think when playing to give this little piece of video game history a chance.