php pdo problem

I'm getting Fatal error: Call to a member function prepare() on a non-object in /home/a9319665/public_html/davez_gamez/core/class.ManageDatabase.php on line 41 which is this
$query = $this->link->prepare("SELECT id, picurl1, name, description ,price FROM games");
I don't understand why because I have function __construct which I thought was supposed to instantiate it.
Anyway not sure what to do with the error.
Can anyone help?
Here's the relevant code.

class.ManageDatabase.php
<?php
include_once 'core/class.Game.php';
    class ManageDatabase
    {
        public $link;
        
        function __construct()
        {
            include_once('class.database.php');
            $conn = new database;
            $this->link = $conn->connect();
            return $this->link;
        }
        
        function getData($table_name, $id=null)
        {
            if(isset($id))
            {
                $query = $this->link->query("SELECT picurl1,name, description, price FROM $table_name WHERE id = '$id'  ORDER BY id ASC");
            }
            else
            {
                $query = $this->link->query("SELECT picurl1,name, description, price FROM $table_name  ORDER BY id ASC");
            }
            $rowCount = $query->rowCount();
            if($rowCount >= 1)
            {
                $query->setFetchMode(PDO::FETCH_ASSOC);
                $result = $query->fetchAll();
            }
            else
            {
                $result = 0;
            }
            return $result;
        }
        
        function getGames($table_name, $id=null)
        {
            try {
                $query = $this->link->prepare("SELECT id, picurl1, name, description ,price FROM games");  //the error line
                 $query->execute();
                
                
            } catch ( PDOException $ex ) {
                    echo "An Error occured when retrieving games: " . $ex->getMessage ();
            }
            $rowCount = $query->rowCount();
            if($rowCount<1)
            {
                $query = 0;
            }
            return $query;
       }

class.database.php
<?php
    include_once 'config.php';

    class database
    {
        protected $db_conn;
        public $db_name = DB_NAME;
        public $db_host = DB_HOST;
        public $db_password = DB_PASSWORD;
        public $db_user = DB_USER;
        
        function connect()
        {
            try
            {
                $this->db_conn = new PDO("mysql:host =  $this->db_host;dbname=$this->db_name", $this->db_user, $this->db_password);
                return $this->db_conn;
            }
            catch(PDOException $e)
            {
                return $e->getMessage();
            }
        }
        
        
    }
?>