Activate a forward shield, then press Option 1 + Pause to restart the game. The shield will be floating in front when game play resumes. Note: The shield will turn to normal after you fire a weapon.
Level 19 bird
Wait until a bird to appear from the left side on level 19. Jump on the bird as it approaches and ride it across the screen to pass the difficult sections of the level. Jump to the right with each bounce to stay above the same bird. Kill the bat when it appears.