Forced into Top-Notch Mechas to Overthrow the Galactic Empire

I was picking up trash in the rust belt and was infested by a blob of living alien metal. It says it was created to overthrow the "Galactic Empire". Now, the imperial army has targeted me, and the nobles regard me as a stain that must be removed. They laughed at my mecha as a piece of junk thrown together from a garbage heap. Little did he know that my symbiote could swallow their flagship main gun and assimilate their imperial mecha. When the empire's S-class armor came to my planet, I pressed him against the wall and whispered in his ear: "Your mecha... Is delicious."