my best is 90,867,100. i self destructed down to 1 life, didn't take any unintentional deaths and point-blanked as much as i could but it's possible to push the score a lot farther. i think you can get a ton more points out of the final boss (which i didn't kill. don't know if it's possible)
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Thanks for playing!
You can definitely squeeze more points out of the boss by killing it with an active chain (preferably 64x, the maximum), which means you have to be able to carry such a chain into the boss and sustain it the entire fight with well-timed self-destructs (since an SD refills the chain timer completely), which also means you need to manage your lives in a way that lets you self-destruct enough times to last the duration of said fight.
The last part isn’t as bad as it sounds, considering a self-destruct does a ton of damage, and the post-SD i-frames allow you safely pointblank the boss.
You also get a smaller bonus based on how much time you had left after killing the boss.