PigPonyPocalypse is a twin-stick shooter built entirely around boss fights. The game consists of four bosses with no levels in between, and each boss has its own mechanics: a fight in darkness, a collapsing bridge chased by a wall of fire, floor tiles that explode in a sequence the player has to memorize, and a final boss with four phases. Every boss can be fought on two difficulties, Forgiving and True Challenge, the latter adding new phases and mechanics. Victories post the player's damage per second to per-boss Steam leaderboards, and achievements unlock color variants for the heroine.