The turtle’s theme is bullets that spawn on or bounce off the edges of the screen. So most of the patterns don’t look particularly impressive, but they’re still challenging.

For each boss’s last pattern I’m sticking in a super-dense graze-fest. Bigger bullets are worth more points!

Btw, all of my screenshots are on Heavenly difficulty.
Casual difficulty is about 25% density, Hard is 50%, and Heavenly is 100%.