Help wanted :O (what am I doing wrong?)

// --------------------------------------------------------------------
// Setup T2D Scene.
// --------------------------------------------------------------------
function setupT2DScene()
{
 // Create fxSceneGraph2D.
 new fxSceneGraph2D(t2dSceneGraph);
 
 // Associate Scenegraph with Window.
 sceneWindow2D.setSceneGraph( t2dSceneGraph );
 
 // Set Camera Position to be centered on (0,0) with
 // view width/height of (100/80).
 sceneWindow2D.setCurrentCameraPosition( "0 0 100 75" );
 
 // Set up the images for the game
SetupImages();

 // Set up the player's stuff
CreatePlayer();
 
 // Set up the enemy
CreateEnemy();
}

function SetupImages()
{
   // Create an image for the player ship
   datablock t2dImageMapDatablock(playershipImageMap)
   {
      mode = full;
      textureName = "~/client/images/playerShip";
   };

   // Create an image for enemy ships
   datablock t2dImageMapDatablock(enemyship1ImageMap)
   {
      mode = full;
      textureName = "~/client/images/enemyship1";
   };
   
   // Create an image for the enemy's missiles
   datablock t2dImageMapDatablock(enemymissileImageMap)
   {
      mode = full;
      textureName = "~/client/images/enemyMissile";
   };
}

function CreatePlayer()
{
   // Create the player's ship sprite
   $player = new t2dStaticSprite() { scenegraph = t2dScene; };
   $player.setPosition("-35 0");
   $player.setSize( "14 7" );
   $player.setImageMap( playershipImageMap );   

   // Create a new action map.
   new ActionMap(playerMap);
   
   // Bind keys to actions.
   playerMap.bindCmd(keyboard, "w", "playerUp();", "playerUpStop();");
   playerMap.bindCmd(keyboard, "s", "playerDown();", "playerDownStop();");
   playerMap.bindCmd(keyboard, "a", "playerLeft();", "playerLeftStop();");
   playerMap.bindCmd(keyboard, "d", "playerRight();", "playerRightStop();");
   playerMap.bindCmd(keyboard, "space", "playerFire();", "");
   
   // Activate the action map.
   playerMap.push();
}

function CreateEnemy()
{
   // Create an enemy ship
   %enemy = new t2dStaticSprite() { scenegraph = t2dScene; };
   %enemy.setImageMap( enemyship1ImageMap );
   %enemy.setSize( "14 7" );
   %enemy.setPosition("40 0");
   
   // Move the enemy towards us.
   %enemy.setLinearVelocityX(-20);

   // Create an enemy missile and fire it
   %enemyFire = new t2dStaticSprite() { scenegraph = t2dScene; };
   %enemyFire.setPosition( %enemy.getPosition() );
   %enemyFire.setSize( "3 1.5" );
   %enemyFire.setImageMap( enemymissileImageMap );
   %enemyFire.setLinearVelocityX( -35 );
   %enemyFire.setWorldLimit( kill, "-60 -40 60 40" );
}