*contains minor spoilers*
So this series was extremely interesting in the beginning, but then it got cancelled and was concluded with only four volumes. That alone should be enough information for some people. Still interested?
Story: At a sacrificial ceremony the MC saves the damsel in distress and kills a local God. Thus becoming the new local God. This was a good, solid beginning of a story. But after that nothing really happens. The villagers won't accept a human as the new God, romance goes nowhere due to the yandere lil'sister. And fights can last 20 pages and end with the enemy running away only to
Art: Good art, but this is a Light Novel we're talking about. Not a manga. So it's not a big part of the work itself.
Characters: With the non blood-related yandere lil'sister and the OP main character out for revenge after the big-sister was murdered by the church, it's all so generic while being too much too fast. A story should have characters grow, but this feels like missing the first movie of a trilogy.
All in all, the world itself is among the most interesting ones I've read about. But the focus on drama and too long fight scenes makes the story lose it's charm. No real explanation about how he created guns or the motorcycle in a medieval fantasy world. And with (yet another) incest romance ending, I lost any respect for this piece of literature I had.
Honestly, I wanted to like this series'. But the author simply wasn't good enough to make this interesting fantasy world into a growing story. It was cancelled but at least the author got some experience.