Gravity Armor Metal Storm

In 2501, after a rogue robotic cannon on a Pluto defense outpost malfunctions and destroys planets like Neptune, humanity's last hope is the M-308 Gunner, a sophisticated combat mech. Players storm the base, manually triggering its self-destruct while using the gravity reversal mechanic—pressing Up to flip gravity and walk on ceilings or run on walls. Gameplay features side-scrolling action-platforming with limited weapons: a wall-piercing wave/plasma beam, one-hit shield, and gravity fireball that makes the mech invincible during flips. Collect power-ups like armor, 1-UPs, point bonuses, extra time, crusher waves, and beam power-ups. Story highlights the mech's immortality and future protection role for Earth. What makes it stand out is the innovative gravity flip system, unique to this title, blending platforming precision with mech combat on NES.