C# game

using System;
using System.Collections.Generic;
using System.Drawing;

namespace CSLightFirst
{
    class Program
    {
        static void Main()
        {
            Console.CursorVisible = false;

            Random rand = new Random();
            Point playerPosition = new Point(3, 3);
            int playerDX = 0, playerDY = 0;
            Point bonePosition = new Point(1, 1);
            int collectedBones = 0, allBones = 10;
            bool isPlaying = true;
            bool isBoneEat = true;
            List<Point> emptyCellsPositions = new List<Point>();
            char[,] map =
            {
                {'#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#'},
                {'#', ' ', ' ', ' ', ' ', ' ', '#', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '#', ' ', ' ', '#'},
                {'#', ' ', ' ', ' ', ' ', ' ', '#', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '#', ' ', ' ', '#'},
                {'#', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '#', '#', ' ', '#'},
                {'#', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '#'},
                {'#', '#', '#', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '#'},
                {'#', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '#', '#', '#', '#', '#', ' ', ' ', ' ', '#'},
                {'#', ' ', ' ', ' ', ' ', ' ', '#', ' ', ' ', ' ', ' ', ' ', '#', ' ', ' ', ' ', ' ', ' ', '#'},
                {'#', ' ', ' ', ' ', ' ', ' ', '#', ' ', ' ', ' ', ' ', ' ', '#', ' ', ' ', ' ', ' ', ' ', '#'},
                {'#', ' ', ' ', ' ', ' ', ' ', '#', ' ', ' ', ' ', ' ', ' ', '#', ' ', ' ', ' ', ' ', ' ', '#'},
                {'#', ' ', ' ', ' ', ' ', ' ', '#', ' ', ' ', ' ', ' ', ' ', '#', ' ', ' ', ' ', ' ', ' ', '#'},
                {'#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#', '#'}
            };

            PrintMap(map, emptyCellsPositions);

            while (isPlaying)
            {
                Console.SetCursorPosition(playerPosition.Y, playerPosition.X);
                Console.Write('@');
                System.Threading.Thread.Sleep(250);

                if (Console.KeyAvailable)
                {
                    ConsoleKeyInfo key = Console.ReadKey(true);
                    ChangeDirection(key, ref playerDX, ref playerDY);
                }

                Move(ref playerPosition, playerDX, playerDY);

                if (isBoneEat)
                {
                    isBoneEat = false;
                    Point newBonePosition = emptyCellsPositions[rand.Next(0, emptyCellsPositions.Count)];
                    map[newBonePosition.X, newBonePosition.Y] = '!';
                    map[bonePosition.X, bonePosition.Y] = ' ';
                    DrawBone(newBonePosition, bonePosition);
                    bonePosition = newBonePosition;
                }

                if (map[playerPosition.X, playerPosition.Y] == '!')
                {
                    collectedBones++;
                    isBoneEat = true;
                }
                ShowActualScore(0, map.GetLength(0) + 2, collectedBones, allBones);

                if (map[playerPosition.X, playerPosition.Y] == '#')
                    isPlaying = false;
                if (collectedBones == allBones)
                    break;
            }

            if (!isPlaying)
                ShowFinalText(0, 15,
                    "Вы не смогли собрать все косточки...",
                    ConsoleColor.DarkRed);
            else
                ShowFinalText(0, 15,
                    "Позравляем, вы откопали все косточки в этом дворе!",
                    ConsoleColor.DarkGreen);
        }

        private static void ChangeDirection(ConsoleKeyInfo key, ref int playerDX, ref int playerDY)
        {
            switch (key.Key)
            {
                case ConsoleKey.UpArrow:
                    playerDX = -1; playerDY = 0;
                    break;
                case ConsoleKey.DownArrow:
                    playerDX = 1; playerDY = 0;
                    break;
                case ConsoleKey.LeftArrow:
                    playerDX = 0; playerDY = -1;
                    break;
                case ConsoleKey.RightArrow:
                    playerDX = 0; playerDY = 1;
                    break;
            }
        }

        private static void DrawBone(Point bonePosition, Point oldBonePosition)
        {
            Console.SetCursorPosition(oldBonePosition.Y, oldBonePosition.X);
            Console.Write(" ");

            Console.SetCursorPosition(bonePosition.Y, bonePosition.X);
            Console.Write("!");
        }

        private static void Move(ref Point position, int DX, int DY)
        {
            Console.SetCursorPosition(position.Y, position.X);
            Console.Write(" ");

            position.X += DX;
            position.Y += DY;

            Console.SetCursorPosition(position.Y, position.X);
            Console.Write("@");
        }

        private static void ShowActualScore(int x, int y, int score, int maxScore)
        {
            Console.SetCursorPosition(x, y);
            Console.ForegroundColor = ConsoleColor.DarkCyan;
            Console.WriteLine($"Косточек собрано {score} из {maxScore}");
            Console.ForegroundColor = ConsoleColor.DarkRed;
        }

        private static void ShowFinalText(int x, int y, string text, ConsoleColor foregroundColor)
        {
            Console.SetCursorPosition(x, y);
            Console.ForegroundColor = foregroundColor;
            Console.WriteLine(text);
            Console.ReadKey();
        }

        private static void PrintMap(char[,] map, List<Point> emptyCellsPositions)
        {
            Console.ForegroundColor = ConsoleColor.Yellow;

            for (int i = 0; i < map.GetLength(0); i++)
            {
                for (int j = 0; j < map.GetLength(1); j++)
                {
                    if (map[i, j] == ' ')
                        emptyCellsPositions.Add(new Point(i, j));
                    Console.Write(map[i, j]);
                }
                Console.WriteLine();
            }

            Console.ForegroundColor = ConsoleColor.DarkRed;
        }
    }
}