The narrative isn't necessarily bad, but the issue lies in its simplicity. The story feels like a basic civilization game, where the protagonist, upon arriving in the new world, instantly commands the creation of gunpowder weapons without delving into the sourcing of resources, finances, or the intricacies involved. The process of turning a musket from an idea into reality is glossed over, making it seem too easy.
The same applies to cannon production; it's a linear progression of "make gunpowder" -> "acquired", "make cannons" -> "acquired", and so on. There's no development of a realistic industrial infrastructure, no sense of time and effort required to achieve each milestone, no character skill-building, or consideration for financial planning.
In essence, I hesitate to classify this as a true kingdom-building novel and would rather describe it as a straightforward "acquire technology" simulation.