Terms used in game: Overkill: Every extra damage dealt below 0 gives 1 extra cash. Cash: The currency you use to buy upgrades. Cash is gained every round, the amount determined by the current Round. Strength Coins: The currency used to upgrade yourself permanently. You gain 1 strength coin every round. HP: the amount of damage you can take. Enemy HP: the amount of damage the enemy can take. Damage: The amount of HP you take away with 1 tap. Enemy Damage: The amount of HP the enemy takes away from you, the amount determined by the leftover hp they have divided by 2.