It's good.
But it's too tough for me...hehe...Good idea for a game, but its kinda hard to see which rows the zombies are in when there are 2+ at once, and i can never get the timing right when they stack-like more than one in a row, or several, one at a time per row, almost all at once, without much warning...but on the upside it was a great experience-i also recommend making a 4-button system, as opposed to the 5 needed to play at present, given that humans tend to only have 4 usable fingers to play with-the thumb is hardly useful for anything but button mashing and console games.