Arrow keys/ WASD to move, space to shoot. Your bullet can change directions when you move after it is fired, but you can only fire 1 bullet at a time. The bullet does damage to the enemy even when the bullet isn't moving. Reduce the enemy's health to 0 befor the enemy reduces your health to 0.
My biggest project so far; have been working on this one since a little after I joined Scratch. Music by me.