GAME STUFF (dumb idea)

so I'm not actually trying to program a game, but i'd like to make music for and illustrate an imaginary game that I made up 💀 I don't have a structured plot but basically a girl gets trapped in a game.. A MUSIC GAME!! (this is so stupid omh) and she has to sing her way thru the levels :P idk whether to make her voice into an instrument or have a human voice lolz