Funguys Swarm places the fighter in a burning forest to confront the Fire King's army with forest weaponry and unusual abilities. A variety of heroes are available to choose from, each with unique abilities for different combat approaches. The player's primary goal is to withstand a constant onslaught of fiery minions and mutated vegetables, which escalate in intensity over time. Surviving in a top-down arena requires constant maneuvering and timely elimination of these threats.