Earlier quoted context omitted.
It is pretty easy to build for iOS, Android, and web.
Getting it built isn't too bad (at least iOS and Android, Web was giving me WebAssembly errors I couldn't figure out), but accessing native functionality seems harder and do not have any good tutorials (a couple really old discussions online that are probably out of date is all I could find). Like if you want to release a game on iOS you're going to need some sort of Ad framework and access its game center for achiev…
I have managed to expose some native apis from iOS, web, Windows and Steam but that is far less straightforward and the LLM is sure it knows what to do and it does NOT. Web searches are not great either.