Use raw score for fitness

src/world.rs

@@ -99,8 +99,7 @@ impl World {
                 self.over = true;
             }
         }
-        self.fitness =
-            (self.score / self.player.shots as f32).powi(2) * self.player.lifespan as f32;
+        self.fitness = self.score;
         self.asteroids.append(&mut to_add);
         self.asteroids.retain(|asteroid| asteroid.alive);
         // if self.asteroids.iter().fold(0, |acc, x| {