A couple of changes and you're good
The grahics are cool, and for a first shot, it's awesome. Theere needs to be a zombie squish, a car explosion sound, a pause button, and a mute button for the music(it was cool, but it got annoying after a while). It's a good concept, so continue it! Build it up, and show that you can make a little game a lot better.
it would be much better if you actually light the whole area but this is fine too. I like it.