Bloodletter is a game where players assume the role of a medieval doctor, healing villagers while combating an eldritch god's influence in a town plagued by supernatural forces. Players manage metrics such as purity, health, sickness, and trust using a deck of cards to cure ailments and build trust with townsfolk. Successful interactions yield special cards that provide bonuses, while nightfall introduces a malevolent entity that increases the game's difficulty. Players must strategically prioritize which villagers to save, adapting their tactics to overcome challenges. Each day brings new obstacles, and players can enhance their decks through bonuses from trusted villagers. The game's striking visuals contribute to its immersive experience, making it a notable title in the deckbuilding genre.