The beginning was fun but after a dozen levels or so it becomes a grind-fest. Dodging is not a possibility once your ship is taking up half the screen.
Made the game unplayable from that point.
I liked the counter telling me how many people remained in a city, but I feel that I would have liked to have a counter showing how many zombies I had.
When the game gets running it gets hard to keep track. Great game overall though, it deserves to be near the top of the standings.
I don't like how the exit point randomly spawns. If I knew where it came out, I'd have a much funner time. Instead of going where it had come out last time, and finding it was now elsewhere.