Sorry I'm pretty new to playing this game but why isn't there a high score record?

I'm interested in speedrunning bosses rather than the full game. just curious why there's no leaderboard for each boss (R level maybe)

Hello everyone, I'm pretty new to the whole speedrunning thing. I used to play a ton of Wii Tennis so decided to look up if anyone was doing it. Well, the record was 9.56 by rmb0257. which at first I didn't think much of it until I did my first few runs which clocked in between 13-16mins. After getting my ego checked and reviewing his run(s) I tried again and got a 12.55 which is 3minutes off the WR! Since then I've managed to get an 11.55.98, however, I wanted to try and get that down to sub11 in the next few weeks. Decided to get a forum up and running to talk RNG, strats, etc. to try and help anyone and everyone make a push close to the WR set by rmb0257 nearly 6months ago. It hypothetically is possible to go lower than the 9.56 he set but is going to be a long haul. I and SoyhoiBoy have been battling back and forth for 2nd place so hopefully we can help each other out and get closer to the WR.