In Z-Type, your goal is to destroy enemy spaceships by typing the correct word associated with each one. You can increase your points by maintaining a combo multiplier, but be careful not to misspell words or make typing errors, as this will reset the multiplier. To improve your performance, it's important to practice proper typing technique, focus on shooting down larger ships first, and avoid projectiles. As you play and practice, you can improve your typing speed and accuracy, as well as your spelling skills.