Clone of the Intellivision game Night Stalker. You are in a
two-dimensional maze in which you are attacked by robots that
shoot at you and that you must shoot down. You must pick up a
gun somewhere in the maze in order to have a few bullets to shoot.
Avoid the spiders and the bats, which can paralyze you long enough
for a robot to come and shoot you. The bunker in the center is
your only protection