Echoes of you

Kai was a genius Data Engineer with a death sentence. To save his family from poverty, he struck a Faustian bargain with the shadowy Pre-Superintelligence Hive-Mind Data Industries: they would fund his final months in exchange for his consciousness.
Six centuries later, Kai wakes up.
The world he knew is gone, replaced by a desolate landscape of black water and radiation. He is no longer human, but a centaur-like mechanical construct integrated with a Hive-Mind AI named Elli-a digital replica of his deceased best friend. Stripped of his organic body and suppressed by logical sub-routines, Kai must navigate a planet where humanity has vanished into "Reality Cracks" and the sun and moon have become lethal forces. In a world of rust and silence, Kai and Elli are the last echoes of a forgotten race, searching for purpose in the ruins of a failed evolution.