Use the WASD keys to move. Press the spacebar to fire a projectile. Use mouse to aim. Hit the asteroids with a projectile to get points. Your points will slowly drain. If an asteroid hits your spacecraft, you lose. If your points reach 0, you lose. Hard mode just means that if your score is higher than 50, the asteroids will start to destroy each other, which will create more asteroids for you to fend off. This won't give you points, however.
Created for TEEN Game Design Class. Credits to the book "Scratch 3 Programming Playground," pages 120-146 for the basis of the coding. https://nostarch.com/scratch3playground for the assets. I added a life counter, a hard mode, explosions for the asteroids.
