[azakai]

You can compile the game to wasm and run it in a web environment. That can be a wrapper around a system webview, so you don't need to actually bundle a web engine in your app.

The web environment would provide all the API support for your game: graphics, audio, networking, etc. in a cross platform way.

This works today - many game engines compile to wasm, from Unity to Godot - but it is more popular to ship a native build of the engine on each platform rather than use a web environment. But that's because those engines take the time to port to each of those platforms; instead, you can use wasm + the web to get portability in a much simpler way (but with some limitations, of course).