Передвижение объектов в игре одновременно

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, 
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    procedure FormKeyDown(Sender: TObject; var Key: Word;
      Shift: TShiftState);
    procedure FormCreate(Sender: TObject);
    procedure FormKeyUp(Sender: TObject; var Key: Word;
      Shift: TShiftState);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  left1, up2:boolean;

implementation

{$R *.dfm}

procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
begin
if (key = 49) then left1 := true;
if (left1 = true) then button1.Left := button1.Left + 1;
if (key = 50) then up2:=true;
if (up2 = true) then button2.Top := button2.Top + 1;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
left1:=false;up2:=false;
end;

procedure TForm1.FormKeyUp(Sender: TObject; var Key: Word;
  Shift: TShiftState);
begin
if (left1 = true) then left1:=false;
if (up2 = true) then up2:=false;
end;

end.