Don't use a password. You want to build a list of members because the value of your games lies in the site membership. The formula is a simple one. The more members and active uses, the more google ad revenue and so on....
Not really. Like I said, I intend to create an online portfolio to show the games only for companies and institutions. I just want that anyone have access to images and informations, but they will need a password to play the game.