You are Alfred(Phrédo)Robrtson, an elictrical engineer who helped to construct the Aperture power-grid as well as wire GLaDOS into it. Kept on-site in case of emergency you were forgotten by the now deceased employees as well as GLaDOS*. You are woken up by your containment unit in its final moments of back-up battery life and you alone explore and escape while finding clues piece by piece about the past and present of Aperture Science. You are the Escapist.
Don't judge the skybox, cubemaps, or lack of optimizing. It's still heavily under construction. By secretly making certain surfaces unportalable makes traveling around a lot harder than it looks. Also; don't fall.
im assuming that the city will have more color and texture. Right?
Right.
The city is made out of moon rocks? :O
It's sort of a plastic. Those materials will be used on the larger buildings, but most of of the others will be a type of brushed metal in different varieties.
You can make a Trigger_hurt to the down to make people dead there down.
There will be, hence testing with those balconies. Forgot to mention.