Cool game! thanks for making it co-op, played it with my young son. We had some fun :-) Controls were easy. Concept is interesting.
My biggest wishlist items would be something that more visually shows you where the dimmed buildings are, like indicators on your main map. The minimap is a bit too difficult to parse while you are driving.
And secondly the collision physics, I wish it would reflect you off surfaces instead of stopping your momentum entirely.
But other than that, very good job!! :-)