YMMV / Metal Storm

• Anticlimax Boss: The Final Boss has you shoot out four locks that cannot attack the player. You do, however, have 30 seconds to do this or it's an instant Game Over!
• That One Boss: The boss of Stage 6 is a Cranium Ride on top of three pods rotating around a room with a deadly floor and ceiling, and destroying them means limiting your mobility more and more. On top of that, they can only be shot once before turning invincible for a few seconds, and have way too much HP for a boss of that type.