When Adobe killed Flash Player in 2020, I didn't want my Flash games to disappear forever.
The way forward was obvious; I'd have to make my own Flash player.

A fairly detailed description of how a game developer converted Flash games to run natively.

Love this bit:

Although I developed the game mostly on my Mac, during development Apple invented this thing called “Notarization” where if you run any app on a new version of MacOS, it'll make a network request to Apple to ask if the app's developer pays Apple a yearly fee.