Matryosick

operation
◁▷: Move left and right
△: Shoot a harpoon

Shoot the harpoon to destroy the balls while being careful not to get crushed by the flying balls.
With the exception of some balls, you can destroy them with anything other than the tip of the harpoon.
When you destroy a ball, it splits into smaller balls, so if you destroy it when it becomes the smallest, it will disappear.