When you tap the fish, it will sort and attack the enemy.
As a result of the fish sortie cost, which is set at a maximum, the timing of the fish sortie is crucial. As soon as the fish touches the enemy or white, it attacks it. Attacks damage the enemy's castle or enemy and it is necessary to inflict damage on the enemy's castle in order to clear the game. On the other hand, if your castle's health reaches 0, you can start over as many times as you like. Because there is no other health indicator besides the castle, you need to be cautious when the fish will fall.