Thanks for trying my game! The way battles work in the game is that each body part has an ability, and you use it by clicking one of your parts and dragging it to the target. For example, you could use a default arm by clicking the arm and dragging the dotted line to one of the worm's segments to deal damage. The worm is also made of different parts, so you have to defeat all of the worm's parts to win the battle. You can see the current health of any part (yours or the enemy's) by hovering over it.