If you want to complete the game easily, then read this tip thoroughly. First, you should set the options to 9 credits. Then, fire 5 things with the light-gun set to auto-tire. This method is very helpful when you deal with giants.
When it’s time to defeat the final boss, which is the most difficult thing, by the way, shoot the lighting once to make it disappear. Do the same thing with the blades and then if you keep firing the boss, he will die soon.
Remember that all bonuses are available before you get to the final boss. But to pick them, you shouldn’t use a continue.
When you are near the parking entrance, try to make the security guard pursuit you twice. Then look on your right and find the bonus in one of the barrels.