Your health is equal to the number of cards in your deck. Every point of damage taken results in an enemy stealing one card from your discard ("block") or draw ("life") pile. If your deck is exhausted, the game ends.
While praised for its deep strategic core, some players find the repetitive nature of its difficulty levels—which require beating the game eight times per character—to be a drawback.
Features mechanics for high energy generation and thinning out enemy ranks rapidly.