Oxymous Prime is a hybrid between a shot'em up and a platform game, developed with RPG Maker VX and released with a freeware license.

The player controls Oxy, a famous bounty hunter. Oxy's current mission is to save a rare bird kidnapped by the groulen poacher Borden. Borden is hidden in a groulen Mothership and Oxy must break into the ship and fight an army of robots and soldiers to complete his mission. After the third mission, the story moves into a unknown planet where Oxy must pursue Borden among dangerous creatures. The story mode has nine different missions.