I really liked this game. But there was a very annoying part of it: the movement. It's very uncomfortable that you always have to click the move button befor you could click to the desired position. You should alway be in move mode so that movements could be made with just one click. You clould still switch to shoot mode by clicking the crosshair.
Also the toolbar would be better as a thin ribbon on the bottom (or the top) of the screen instead of in a box wich always covers something. (By the way, when I move the box, then click for the character screen, most of the times the box goes back to its original position, wich is kinda annoying becose I moved it for a reason.)
And another thing: while I don't care about high scores too much, if there is a score board, it would be nice to know how the scores are calculated. I just completed the game in 'Apocalypse' mode, killed all zombies and searched everything, yet I could only make it to the 946th place with 664 points and there are people with more than 900 points.