As you start playing there doesn't seem to be much of a story. A few philosophical messages left behind by the Sign Painter and a cut-scene here or there. But as you progress through the game you unearth different details about a slightly disturbing world.
World of Goo is pleasing to look at. Most of the time it's very colorful and joyful, but it changes from time to time to reflect different parts of the world. Nevertheless, it is stylistically well presented throughout the game.
The rocket designer lets you experiment with as many different rocket designs as you can think up. The designer is based on components such as engines, fuel cells, structural elements and various other items such as parachutes.
In order to maintain its immersive nature, Mirrors Edge has virtually no UI, other than a small dot at the center of the screen. This should ward off motion sickness for most people, but be aware that if you're queasy, you might not feel too well after playing.
The game's core mechanic is about traversing levels using wall-jumps, rolls and slides without losing momentum. It does a great job of creating a fluid sense of motion that you have complete control over.