It's simple, you're a goat. You destroy things. There are a lot more things you can do like get achievements or unlock new goats. The graphics may not be good and it may be very glitchy but that what makes this game so fun. Just completely destroying the game is fun and the glitches aren't really that annoying.
Don't expect a masterpiece of a game, just a simple concept and simple fun.
Review of Goat Simulator
