Atom Zombie Smasher is good fun, but so frustrating when you get the faster zombies and shorter daylight. I'll restart a mission umpteem times and still never win. Then you get some missions where you manage to wipe out all the zombies and save everyone without much difficulty at all. It just fluctuates so much, overall I am enjoying it though. In the July mission I managed to save everyone which was more than enough for the achievement, however it took about 4 restarts to do so.
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Indie game board: http://www.gamefaqs.com/boards/293-indie-gaming