function update() {
  // Convert the mouse position to world position within the camera
  const worldPoint = this.input.activePointer.positionToCamera(this.cameras.main);

  // Draw tiles (only within the groundLayer)
  if (this.input.manager.activePointer.isDown) {
    groundLayer.putTileAtWorldXY(353, worldPoint.x, worldPoint.y);
  }
}