Just gonna gank my comment and post it:
it is quite a unique game. My PC has a decent vid card, 1 gb of ram, and a single core AMD 3500+ and it struggles really bad. I dialed down everything and it is much better.
Still the game is pretty cool. Reviews for it say it is too short of a game. I made it about 1/2 way through in 30 minutes. It gives you 6 levels after you beat it, but they are the same levels with restrictions like steps or portals. The computer that talks to you is pretty funny.
I am currently on level 18 out of 19 and I have watched a few vids. The one below is amazing. I think it shows how this is not just a one time through and move on to the next game type of game.