Surprisingly, this isn't bad. There's a decent setting with organic world-building, which is rare in isekai manga. The MC and his love interest aren't paper-thin stereotypes. There's an overarching plot that doesn't involve a harem (there is a harem tag for this manga, so I guess that won't last 😟). The MC is a bit OP, but it's within the realm of being reasonable.
15 chapters in, the MC isn't able to level a country yet, but I am concerned about future power creep. Also, there aren't levels, skills, or a status screen, which is great. It allows me to focus on the story rather than on the MC's giant epeen.
While this does meet the strict definition of 'isekai', I hesitate to identify it as such. It's not clear that the MC is from Earth. He's just a human from a sci-fi fantasy setting who crash lands on a world that's at the technological level of medieval Europe. Also, there's magic.
It's not bad overall, but it's certainly not a masterpiece. It's much better than an average isekai, and it didn't make me feel like I'm getting dumber while reading it. My greatest gripe is that the translation is definitely not done by a native English-speaker. This series is in serious need of a proofreader. Despite the questionable translation, I'm comfortable giving this a solid 7/10.