"Release That Witch" is far superior, but I can see a lot of similarities in the stories.
The main character is not that smart but portrayed as so, the girls are somewhat cute, and the story is pretty generic for the kingdom building genre. The main character is given various superpowers (several), which are poorly explained, making his life much easier.
The main character was given overwhelming abilities. Reflecting on this and contrasting it with other stories where the main character is challenged due to personal weakness I have come to understand that the supporting characters have consequently become not as useful, dynamic, interesting, and vibrant. If the main character is superhuman and easily becomes stronger (main character's power is stated to increase every single time he uses his ability without limit ... dimensional travel, modern goods, super strength, super speed, super reflexes, super combat ability ...) there is little tension in the story. Without tension there is no catharsis and therefore all the main character's successes tend to feel trivial.
The other characters also feel trivial because they are being overshadowed by a MC that doesn't have to rely on them. These supporting characters have been reduced to being mere tools. Eg. "Hey, you're good at hunting and conveniently loyal to me. Go train an army from these peasants. I'll let you speak a couple lines in 10 chapters from now." Eg. "Hey, you're old, literate, and look a bit wise. Be a clerk for me and handle all my governance problems concerning ___. You are allowed to speak 1 line per chapter."
It's mediocre in every way. Don't commit to reading it with great expectations. I don't feel like I wasted my time reading it though. It was moderately amusing.