How to connect game to SQLite

I've been trying to connect my game (which will mainly run in WebGL) to a database in order to store highscores and such. After some reading I found that SQLite would be the better choice since it requires little setup, but I haven't been able to connect the game to a database properly.

I've already tried following this link specifically for Unity and this one for a C# library, yet neither one seemed to work for me. I also looked into this plugin but am unsure about how to use it after I've pasted the files into the Plugins folder.

Is there any other way or something I might be missing? For code there's nothing much to show, my test class only has what I copied from the first link:

 public DBInterface()
     {
         string conn = "URI=file:" + Application.dataPath + "/Database/highscores.s3db"; //Path to database.
         Debug.Log(conn);
         IDbConnection dbconn;
         dbconn = (IDbConnection)new SqliteConnection(conn);
         dbconn.Open(); //Open connection to the database.
         IDbCommand dbcmd = dbconn.CreateCommand();
         string sqlQuery = "SELECT * FROM HIGHSCORES";
         dbcmd.CommandText = sqlQuery;
         IDataReader reader = dbcmd.ExecuteReader();
         Debug.Log(reader);
         while (reader.Read())
         {
             string name = reader.GetString(0);
             int rand = reader.GetInt32(1);
 
             Debug.Log("name =" + name + "  random =" + rand);
         }
 
         //SqliteConnection connection = new SqliteConnection(Application.dataPath + "/Database/highscores.s3db");
         //connection.Query("SELECT * from HIGHSCORES"); 
     }

Or would it be easier to use another database? Perhaps MongoDB?