V1.1 Update
Bigger weapons on later levels! From level 8 onwards, you get "ultra" weapons. That's the good news. The bad news is there are more zombies than ever attacking you!
Added a much-requested pause button (top left corner of the screen)..
You can now switch sound fx and music on and off (on the homepage).
Have fun, and let me know if you can score more than 20K points!