Good job with this one. I also liked the clever interpretation of the theme and the mechanic where you don't want to kill them too fast. For me, the game went one of two ways; either I'd die super early or I'd unlock all guards and have nothing to do until I lost. It would have been nice if I had something else to do such as select a priority target to shoot at or upgrade my guards using points. These are just suggestions if you decide to develop more. For this game jam, your game was an excellent addition that I thoroughly enjoyed. Keep up the good work!