The Aquatic Adventure of the Last Human

From Kickstarter: "The Aquatic Adventure of the Last Human is an action/adventure game in the style of Metroid-Vania, in which you play the role of navigator of Argo 9, a spaceship/submarine hybrid that is sent back to Earth in a time when humanity is already extinct. You'll have to find out the reasons for humanity's demise and encounter monstrous sea creatures. The game focuses on exploration, story and boss fights. It's up to the player to decide if the demise of our species is a travesty or an inevitable conclusion."