Zombie War Game in C++

 #include <iostream>

#include <stdlib.h>

#include <unistd.h>

#include <time.h>

using namespace std;

int createZombie() {

    if (rand() % 67 < 10)

        return 11;

    else

        return rand() % 10 + 1;

}

int main() {

    srand(time(NULL));

    char enter;

    // game stats

    int playerAlive = true;

    int playerSkill = 9;

    int playerScore = 1;

    string playerName = "";

    int zombieCount = 0;

    int zombiesKilled = 0;

    // title

    cout << "\t\t\t\t\t\t\t\tMade by: \n\t\t\t\t\t\t\t\tJunaid Aslam \n\t\t\t\sdft\t\t\t\t20SW084\n\n\n\nWelcome to Zombie War." << endl << "\n\n\n\n\n\n\ePress [ENTER] to start.";

    cin.get();

system("cls");

    // player name

    cout << "\n\ePlease enter your name: ";

    cin >> playerName;

    // ask how many zombies

    cout << "\n\n\eHow many zombies do you wish to fight? ";

    cin >> zombieCount;

    cout << "Get ready to fight for your life, " << playerName << "!" << endl;

    // main game loop

    while (playerAlive && zombiesKilled < zombieCount) {

        // create a random zombie

        int zombieSkill = createZombie();

        // battle sequence

        if (zombieSkill > 10) {

            cout << endl << "Here comes a huge zombie!" << endl;

        }

        else {

            cout << endl << "Here comes zombie " << zombiesKilled + 1 << endl;

        }

        cout << "Fighting..." << endl;

        sleep(2);

        // zombie killed the player

        if (playerSkill < zombieSkill) {

            playerAlive = false;

            cout << "You have died." << endl;

        }

        // player killed the zombie

        else {

            if (playerSkill - zombieSkill > 7) {

                cout << "You wasted the zombie!" << endl;

                playerScore = playerScore * 2;

            }

            else if (playerSkill - zombieSkill > 5) {

                cout << "You decapitated the zombie!" << endl;

                playerScore = playerScore * 2;

            }

            else if (playerSkill - zombieSkill > 0) {

                cout << "You killed the zombie!" << endl;

                playerScore = playerScore * 2;

            }

            else {

                cout << "You killed the zombie, but suffered injuries." << endl;

            }

            zombiesKilled++;

        }

        cout << endl;

        sleep(1);

    }

    // end game

    if (zombiesKilled == zombieCount) {

        // victory

        cout << "You have survived the onslaught!" << endl;

    }

    else {

        // lost

        cout << "You did not survive the zombie war." << endl;

    }

    cout << "Zombies killed: " << zombiesKilled << endl;

    cout << "Final score: " << playerScore << endl << endl;

}