Collect powerups and defeat the other squares!

Tap on the left and right side to turn respectively. Collect the powerup, symbolized as a white square surrounding four smaller squares in it, and then collide into the enemy, losing their life. An arrow pointing to the powerup is shown if it is not visible. You and the enemy's lives are shown in the bottom-right corner, color-coded. If an enemy hits you with its weapon, you lose one of your three lives, until no more lives are left, then you lose. If you collide the border, you also lose. Collide the enemy enough times to win!