Not sure if posted earlier. Reminds me of Ikaruga. The more you increase your multiplier, your "absorb" area also increases, which is both good and bad. Avoid the red shapes, the purple shapes will allow you to absorb everything in the screen, minus red shapes.
No, I think the patterns change. They are related to the tempo and intensity of the music, but the shapes, sizes, and frequency of the multipliers (and de-multipliers) seem to be random.
Nice little game. Very ferry-halimesque. Not too challenging either.
The hitbox isn't even, as well. When you've got a huge ball (say 70+), reds can get into your edges without damage.