Making a 3D rythm combat game for a jam is quite... ambitious. And yet you did it! And with no more than 3 boss fight. The art is very cute, the music beautiful and the combat, even if a bit rough, works really well.
With a bit more love and feedbacks, I can easily see this become a full beat'em all or boss fight game.
Small note: For rhythm game, I recommendend giving an executable file. WebGL builds can easily cause desynchronization issues between the music and the inputs.