Never mind, that was just a bad save file. I tried a different one and it worked. I think they played through the game normally, then edited the save to make it 3 HP, but forgot to set the proper flags
Unfortunately, that's only an almost perfect save. You would also need: the regular missile launcher for the the missile capsule (+30 Missile ammo), the bubbler for the bubbler capsule (1 Life Capsule), and the little man either in your inventory, or returned home without having traded for the nemesis.