move enemy

else if (tangent.Key == ConsoleKey.UpArrow)
                {
                    y1--;
                }
                else if (tangent.Key == ConsoleKey.DownArrow)
                {
                    y1++;
                }
                else if (tangent.Key == ConsoleKey.LeftArrow)
                {
                    x1--;
                }
                else if (tangent.Key == ConsoleKey.RightArrow)
                {
                    x1++;
                }