The game looks interesting, but I was unable to go very far on it because the entire game froze up on me near the beginning, usually after I have shot the first zombie (I know it is frozen because the +50 is suspended in mid-air). I restarted the game, but it happened again. (To let you know, I have watched most of the tutorial and know how to play).
I read another review that had a similar complaint and it appeared that you misinterpreted that reviewers complaint, questioning whether or not him or her knew how to play when I think the problem is the one I am describing to you. I don't know if there is a problem with my computer or your game, but my computer has worked for at 95% percent of the games on here. I would like to give you a higher rating since the game looks unique and engaging, but I'm giving you 1.5 stars until the problem is resolved.