Use brick.hit() as a check for whether the brick should be removed.

core/src/com/me/brickbuster/entity/Ball.java

@@ -61,8 +61,9 @@ public class Ball extends Entity {
 				Vector2 nearest = Utils.nearestPoint(v1.cpy(), segment, new_pos.cpy());
 
 				if (nearest.dst(new_pos.x, new_pos.y) <= RADIUS) {
-					brickIterator.remove();
-					brick.hit();
+					if (brick.hit()) {
+						brickIterator.remove();
+					}
 					Utils.reflect(direction, segment.nor());
 					brickCollision = true;
 					break;