The Photon Elf truly is the bane of technological creations, an accidentally emergent being that should not even exist. I really lucked out encountering it, just thinking about it makes me feel fortunate.
If it weren't for the Photon Elf, these last two battles would have been impossible to win so handily. Even with Du You's might, they would have posed a significant challenge, and there was a real risk of failure.
Looking at the final wave of exterminated miner robots in the sky and the vast amount of wreckage left on the ground, Du You touched his head and then decided, "Let's treat this wreckage as raw material; it could be useful for constructing other buildings."
With this conclusion, the temporary mission of the miners' revenge was also brought to an end.