Most of the enemies can be defeated by high damage weapons.
The boss of chapter 18 is one-eyed Cyclops. His eye will shoot a laser to the left or right direction.
So players can stay above or below the Cyclops to avoid being hit by the powerful laser beam.
However, the Cyclops will sometimes throw big rocks at players.Circular movement can help a little bit if your circle is large enough.
You can try a left and right zip-zap movement, just make the zip-zap turn before the Cyclops above to throw rocks.
Recommended chipsets: Aiming Lens, Flamethrower, Polymer Armor, Vibrating Module, Rifle, Laser Eye, Spiral Barrel