Most GitHub-hosted games are passion projects or open-source ports, meaning they aren't cluttered with the aggressive pop-ups found on commercial gaming sites.
Integration with social media for score sharing and achievements is becoming more common. Features like generating shareable images with high scores help games gain organic visibility. gamesgithubio link
Posts with a visual of a specific game usually get much more engagement than just a text link. Tag the creator: Most GitHub-hosted games are passion projects or open-source
(minecraft-classic-unblocked.github.io)