This looks like fun, but I really can't envision myself playing this for any longer than Red Ball 3 on a free site like Kongregate.
Goat Simulator IS really fun, and I'd purchase it if I had the processor power. It's basically Tony Hawk or Skate but you know the rest. Also its graphics ARE pretty good. From the trailer I really don't see much difference between this and most current flash games.
My computer is kinda "meh" when it comes to most games and it runs the game pretty well on low settings, so you might want to give it a try. The best way to explain it is that it's like a whole game based around the "insurance fraud" mini game from the Saint's Row series.