Motion Tracker - Exfil Point

Motion tracker device simulation with a twist. Along with motion of aliens, this motion tracker detects bullet trajectories and signals from friendly targets. Luckily, it has button linked to trigger on your pulse rifle, so you can use it to aim and shoot. Also, there is fire selector switch to choose single or auto fire mode. Tilt your device to turn and aim.Your assignment is to protect exfil (exfiltration) point for civilian retreat. Visibility is zero, so you will have to use device assisted aiming and shooting. Your goal is to defer all approaching alien hostiles and spare friendly targets. In return, every civilian you save will give you his or hers ammunition supply.How long can you hold your ground?