Although the upcoming twin-stick shooter metroidvania BioGun has understandably looked to some of its genre contemporaries for inspiration, some of its best features can be attributed to classics that hail from entirely different genres. For a game that hinges on thorough exploration, skillful traversal, and fast-paced shooter combat, it makes sense that the indie game would look to two iconic franchises that have long served as a blueprint for both adventuring and shooting.