Sharper textures, more exciting trees (as in, doesn't look like a + when seen from above) and shadows for the cars and all that would make it look nicer.
Other than that, it's an unique and interesting idea and its great to see the level of completion you're at. Plus, the town doesn't look bad as it is right now, with streets at angles other than 90°, it makes it looks more like your friendly neighbourhood and not so boring. Congratulations for that! Now, I'm curious as to how the gameplay holds up. It's hard to tell if its really fun!
So in summary, its good so far. Improve the few things mentioned and it will look even better!
Also: This thread is in desperate need of objections. And in case you don't know why, you deserve pity. PITY, you foolishly foolish fool! Man, I love that game.