I heard that the reason why music identifiers don’t work offline is because their databases are huge, with millions of songs (including video game music). Databases containing only video game music may be significantly smaller, even if they contain the soundtracks of over 1000 games.
You probably could. But what’s the target demographic for this?
How many songs does a typical game have? You could just look up the soundtrack and play from the 12 different songs until you find the right one.
I don’t know, but this feature could be implemented on portable video game consoles, similar to the Nintendo Switch or PC gaming handhelds (none of these have this feature or a variation of it right now).