Mixing Google Meets with GuitarHero: what's a cool concept :D
The technical stack is quite impressive, with the usage of Amazon Polly for generating audio... Wow!
The only thing to improve is the game difficulty: I am not good in this kind of game, and I cannot pass the first level x')
I might be the problem here, but I would go to a way easier first level to let people like me enjoing a bit more this fun concept :)