The best part about Fortified is its pulp sci-fi personality. This mash-up of the tower defense and third-person shooter genres plays like the film Mars Attacks! brought to life, complete with Cold War-era alien goons with fish bowls on top of their heads and whirring flying saucers of the sort that made the Earth stand still once upon a time. Sadly, the worst part about Fortified is that this personality is its best part. Gameplay takes a backseat to the congenial story and setting about an alien invasion at around the same point in history when Marty McFly took his mother to the prom. The limited number of bad guys, maps, and overall fresh ideas makes this shoot-em-up enjoyable only in quick, limited doses.