Moon Life: A hundred million years after the destruction of Earth, the landform of the natural satellites molded, reformed, and created a new lifeform from their soil. From that moment, a new civilization started.

A citizen of Titan, Gavin--also a spacecraft designer--has given up hope in life with the past recent days being terrible. He lost his lover, his friends, his job, and his sense of self. His brother calls him after 12 years, and Gavin is given a chance to mend their damaged relationship. Together, they voyage to the moon, Tethys, and meet up with... Gavin from a different universe...

[From Itch.io]