Free app that is NOT worth your time.

Game started out okay—had a few glitches (i.e., clicked on something, and it took a few seconds to register), but since this app is free, I figured that they were tolerable…at first.

Then, glitching started to happen more often and for longer time as I advanced through levels, especially after a melee kill. There were many other places it glitched and so the glitching was getting old really fast.

Another extreme frustration is that the app doesnt block out your computers desktop. My mouse was able to "travel outside" of the game and it opened apps in my dock and started launching them over top of the game. Also, there was no way for me to quit the apps without quitting the game because whenever I tried switching to a different screen in Mission Control, my screen would automatically switch back to the game.
So because of this problem, I lost many missions and therefore ended up wasting precious items like my knives, health, etc. These items are hard to get and if used up, it takes so long to build up cash and credits to buy more. And then, oh goodie, youre expected to pay real money for necessitities like that in the game.

Unless these bugs and glitches are fixed, this game is definitely not worth your time, even if it is free.

Curly Mullato about Contract Killer 2, v1.0.1