Using BrutalGuitar's strategy, I got close a number of times to the score I needed, but never quite enough. So, I tried Jyazu just to switch it up a bit, and I discovered his rapid kick attack. After that, it was pretty much smooth sailing. Jump forward +
, then immediately tap
to do the rapid kick.
The AI seems pretty baffled by it for the first few rounds, and it's probably possible to get a perfect or two, but not totally necessary. Using this simple pair of moves, I was actually able to beat King Leo and finally died at the mirror match, which somehow gave me the current world record of 287750. I have little doubt that score will be beaten in no time.
A big plus of doing it this way too is that the combos give you lots of points, and you can usually pull off a 6-7 hit combo each time you make it connect.
Anyway, big thanks to BrutalGuitar for the code and the guide. I hope one or the other works out for anyone who tries.