TOTAL TROLL!![/Unnecessarysize]
I don't know how to respond to this, but he's (Wiz is) correct, at the moment. The build lacks some serious bits that would establish a good playability, at the moment. The current build is also rather basic and lacks detail that will draw in players.
A quick read of the OP brings me to the conclusion that the build would have to be rather large or a good size. I don't see what you're aiming for here, but the basic playability of the map so far looks like either walking/driving around in wide open streets with no obstacles with AI running at you, which isn't that original. With this idea you could do so much more. Why drive directly from place to place with and escape when you could incorporate anything? Come on, be original. Anything you can think of you can add, be it a rooftop standoff between you and an army of frenzied scientist bots or crawling through a sewer to break into your own basement after your house collapsed. You can build anything, add anything to your map. I'm also not saying that the jeep or any other vehicles that you use should be entirely removed, but I think you should use them to your advantage to create something entirely new for players.
Tl;dr: Try and add more essentials for a good playability to the finished project. And get me again, I'm not saying it's horrible, I'm just saying that there's so much more you could add.
Luck.
