The Armor Upgrade is guarded by a mini-boss who is, unfortunately, weakest to the same weapon you'll want to use against Sting Chameleon -- the Boomerang Cutter. He also can't be damaged by hitting his claw-like hands. On the upside, his attack pattern is predictable, and the heart tank is nearby after you get the Armor Upgrade.
Boss begins: 2:03
Sting Chameleon has a few attacks that litter the screen with projectiles, but quick use of the Boomerang Cutter should keep him too distracted to launch those attacks. Make use of the fact that Boomerang Cutter will follow X, so you can jump to guide the boomerang upwards if you need to.
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