Demon Front is a 2D side-scrolling run'n'gun game similar to the Metal Slug series. Taking place on the once peaceful planet Andres, twenty lightyears from earth, that has been taken over by evil creatures after a red moon eclipse. The creatures killed or assimilated the majority of the inhabitants. Only a few managed to escape. You play as either the earthlings Jake, Dr J or Sara, who have promised to help Maya the ape man. He is one of the survivors and is determent to take his home planet back and save his people.
As you make progress you fight various mutants, monsters, machines and bosses. Each of the four characters has a pet that can be used to generate a temporally shield. The pet will become stronger and grow bigger when collecting hearts and level up. Character can level up by collecting skulls. Killed enemies drop sometimes power-ups that increase you fire power or change your bullets. Each character also has the ability to float across gabs by holding the jump button down, wings will then appear on their back. Holding the fire button down lets the pet accumulate power and when fully charged, letting it go will let the pet attack the enemies. The game can be played solo or with a friend.