That title screen is one of the best in the jam. Dark pixel art with the spotlight on the singer, and an infographic that explains the rules without a single word written. Very elegant. The live leaderboard in the left corner (1. YOU, 2. CPU-A and so on) fits the theme perfectly too, you're not just scoring, you're racing someone specific. Nice touch having the page in both English and Chinese.
Fair warning that I had a technical issue on my end partway through, so this is more first impressions than a full run. But even once I was moving properly my score stayed at 0 while the CPUs climbed past 800. Either the bots are very strong or I misunderstood how you score, I assumed you just pass over the notes. A three second tutorial saying "touch the note to sing" would kill that doubt instantly.
One small thing: the maze only uses the middle of the screen with a lot of black around it, so it could scale up quite a bit. Really promising base though. Pac-Man crossed with a direct fight over the scoreboard is a smart read of the theme.