Problem. 1, WAY too many zombies in the more advanced levels. 2, only one course, and 3, the zombies look more like big angry cubes then zombies. Otherwise, great game.
i want a few things. 1, a way to bring a whole bunch of things to front and/or back at the same time, 2, cannons, thrusters, etc, should be given out for free, and 3, when you haven't saved and are loading something diffrent, a reminder to pop up telling you to save.