You can drive through a city or walk and kill pedestrians and policemen. When you kill all the policeman a huge enemy will appear. Most policeman and some pedestrians will give you a weapon.You can look for ammo, health and petrol (yes, you will run out of it).
The future improvements are: entering buildings, adding menus and inventory, saving and loading games
Here we can see some pictures.
Link to the game
http://www.mediafire.com/?hetstawhaal958d