EDIT: I have finished the game now, and I can honestly say the story in this is far less interesting than the original premise of having no story, and letting the player intepret it how they want. I will however still recommend purchasing either this, or the original (whichever is cheaper) and playing it because it is a good puzzle game.
The following applies to both games, original and directors cut.
Neat puzzle game, decently challenging. Stark black/white visuals with occasional splashes of color to seperate the puzzle elements.
Now, if you have never played this game before, I'd recommend buying the original (especially if it is cheaper). The reason being, the original is a good PUZZLE game with an interesting backdrop. The directors cut feels the need to tell a story, that frankly, has been told a thousand times.
Techincally this version has more content, but honestly I felt the original had a better feel to it simply because it gave you no pretext. It didn't give you a subtext to what was happening, this shoehorns one in for frankly no reason.
So in short, if you can ignore the blatant voiceovers and both are the same price, buy this since it has more content. If the original is cheaper, buy that.
SPOILERS BELOW (not that it matters honestly):
Seriously? A kid broke into your house because there was a fire? Why not call the fire department? Why not yell "Hey there's a fire! The second he broke in? How the hell did you manage to get downstairs without seeing/hearing/smelling a fire?
Also the ending of this game is incredibly concrete (as in there is no room for interpritation) yet it leaves a LOT out in the open.
What happened to the player character? Did he live? Did he die? Was this all a dream? Was the end sequence just something he created in his mind, or did all of that actually happen?
If the end was completely literal, why did solving cube puzzles destroy the "ship"? Why was there not a single inhabitant on the ship? Who built it? Did it just build itself and set a collision course with the earth? Why would it do this? It's clearly been made by something, the entire thing is made up of cubes (sans the television screens and shuttle in the last scene). Which brings up another point, why were there television screens and shuttles in something only made of cubs?
The only credit I will give the story in the Director's Cut was that they turned the whole "crazy man tells you the truth about a goverment consipiracy" cliche on it's head by revealing it was just a stranded man who wanted company. I guess that's something.
Either way this was wholly unnessicary and a large waste of resources for the developer. They should have just put all this time and effort into developing another title instead of writing a mediocre story for the existing game that was actually pretty atmospheric with no dialogue.
So again, buy whichever is cheaper, but honestly I'd recommend the original over this any day.