That's a nice idea,but sometimes,if you don't have a technic,the gameplay is way too hard. The laser can only slice one body at the time , cutting a hand or the head don't kill the zombie,etc. If you make a second one, add more diversity in the characters: I only see Sanford and Deimos or,rarely, a normal zombie; more weapons: the normal laser is okay for 2 minutes; and upgrades for your gun and character,etc.
P.S. : I found a crazy bug were you can kill yourself in a weird position: Jump and put the laser at the maximum power, put it at the edge of your character and here you go,crazy bug. Sometimes it just doesn't happen anyway.