Ouroboros: The Diamond Ark™

Humanity left a dying Earth behind.
You are invited aboard the UEC Ouroboros—a 1,000-kilometre titanium behemoth carrying the final 24 million embryos of the human race across a 25,000-light-year void.
But the price of the stars is paid in human marrow. Under the laws of the Quantum Bypass, a single day on board equals years slipping away on Earth. As the "Bridge Generation," the awake crew departs in their youth only to arrive as centenarians—sacrificing their own lives so their grandchildren might one day walk beneath a foreign sun.
Embark on a journey within the monolith Ouroboros—a colony vessel cradled around a mesmerizing rainforest, where Shinkansen elevators fly between crawl-cities, while the crew battles treacherous old ghosts from Earth and holds tight to the final, desperate discovery of a second chance for humanity.
The past is looping. The trap is closing. Welcome to the Bridge Generation, where humanity's final haven is rapidly becoming a flying tomb.