Pokemon-style Battle Game

Program.cs

class Program
    {
        // This is a Pokemon style text-based battle game.
        static void Main(string[] args)
        {
            bool playing = true;

            Console.Write("Enter your battle monster's name: ");
            string playerName = Console.ReadLine();

            // Instantiate Player objects.
            Player player = new Player(100, 100, playerName);
            Player enemy = new Player(100, 100, "Opponent");

            // Game loop
            while (playing)
            {
                Console.Clear();
                Console.WriteLine("{0}'s HP: {1}/{2}", player.Name, player.health, player.MaxHealth);
                Console.WriteLine("{0}'s HP: {1}/{2}", enemy.Name, enemy.health, enemy.MaxHealth);
                Console.WriteLine();
                Console.WriteLine("You would you like to do?");
                Console.WriteLine("a - Attack opposing monster");
                Console.WriteLine("f - Flee the fight");
                Console.Write("move>");
                string move = Console.ReadLine();

                if (move == "a")
                {
                    player.Attack(enemy);
                }
                else if (move == "f")
                {
                    playing = false;
                }
                else
                {
                    Console.WriteLine("Enter a valid option!");
                }
            }

            Console.WriteLine("Thanks for playing! Game by James Czekaj.");

            Console.ReadLine();
        }
    }

    class Player
    {
        public int MaxHealth { get; set; }
        public int health { get; set; }
        public string Name { get; set; }

        public Player(int maxHealth, int currentHealth, string name)
        {
            MaxHealth = maxHealth;
            health = currentHealth;
            Name = name;
        }

        public void Attack(Player opponent)
        {
            // Generate a random number and assign it to attack variable.
            Random randomNum = new Random();
            int attack = randomNum.Next(10, 20);

            // TODO Figure out a way to exit game loop once a player has 0 health.
            if (opponent.health - attack > 0)
            {
                opponent.health -= attack;
            }
            else if (opponent.health - attack < 0) // Set health back to 0 if it goes minus.
            {
                opponent.health = 0;
            }
        }
    }