To keep score, each time the player rocket hits the enemy, the player will get one point. If the enemy reaches the left of the screen or the enemy bullet hits the player, it should trigger the game over condition.

For this, create two global variables in the GameplayLayer.h file: an int and a bool variable. The int score variable will keep track of the score, and the bool gameOver variable will be used to check the game over condition:

    int score;
    bool gameOver;

In the constructor, initialize these two variables:

    score = 0;
    gameOver = false;

Next, as per our logic, the game should be over when any of the enemies goes beyond the left of the screen or any of the enemies' bullets hits the player. So, to satisfy the condition, add the gameover = true condition while updating the enemies and checking for the collision between the enemy bullet and the player:

    //enemies
    if(enemies->count() >= 0 )
    {
        for...