Mechanical Enemy from Another World

She has the mentality of a poor loser, is startled by everything she encounters, and the writing is immature, at the level of a primary school student.

The subject matter is pretty good, but your protagonist is a bit of a loser. Moreover, 10 tons of Mithril has not upgraded the base to advanced production and high-end combat power first, but has upgraded all sub-bases together. You have achieved some success in production, and you can defeat many of them with one attack. You have to produce all the sub-bases together to produce explosive ash.