I recommend "The Demon God of Science" to you. Although the title doesn't have the keyword God Eater, the book mentions the existence of the Demon God and God Eater in the magic seal. The main character transmigrated to the academy city and became a scientist and a LV5 person. Through endless "calculations", he finally ascended to the Demon God of Science. The book was also filled with a large number of daily worlds, as well as comics such as the moon, the deicide, and the bloodthirsty frenzy. I hope you like my recommendation. Muah ~