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GameLauncher
(github.com)
I'll make a public reply for this, just installed LineageOS on my Galaxy S4 with Android 11. GameLauncher works flawlessly, except: not all games are shown which is a technical limitation of android itself. My app just checks what apps have the APPLICATION_IS_GAME flag, which funnily enough isn't set by all games. Candy Crush for example. And the only way I could add those games is if I manually check those games by their packagename. For example: com.king.candycrushsaga . I mean I could add those games but it would be a minor annoyance to say the least given the sheer number of Android games. I may add a feature that lets the user manually add applications into the list. But for now, it is how it is. EDIT: most people of stackoverflow and other forums check if the app is a game by sending all packagenames to the google play server and check which "tag" comes back. That is not ideal howevery, on my main phone I have over 600 installed packages/apps. Sending all of them to the big G is not only detremental for privacy but also not efficient. Also I want my app to not communicate with the internet at all so you data stays where it should be in the first place.
you could use cloudflare zero-trust, i use it with a docker container which runs cloudflared. it tunnels your services through without a single port open. there are a couple youtube tutorials which are pretty good.