Willpower

You find yourself stranded on a desert island, forced to fend for yourself in a harsh, unforgiving environment.  Each night, a figure will tempt you with a deal: he will take you home, but in return, he will need your soul.  Spend your days taking care of your needs and keep your willpower up, or else you might be forced to sign an unwanted contract.

LDjam page: https://ldjam.com/events/ludum-dare/39/the-will-to-live-a-game-about-willpower