Not sure if it will be allowed on Google Sites, but you can try to insert the iframe code below into your site.
<iframe frameborder="0" src="https://itch.io/embed-upload/5398792?color=57a5eb" allowfullscreen="" width="454" height="602"></iframe>
Viewing post in Pac-Man and Ms. Pac-Man comments
It works & I gave credit to you. 😄 Link: https://sites.google.com/view/unblock3d/pac-man