I watched this animated movie 6 or 5 years ago.
It was about a spreading disease that turns humans into stone; it forced a company to make a project to freeze a bunch of people for 100 years in a castle hoping the disease will be gone by then. (I think they called it the "sleeping beauty project.")
The story follows two twin girls, a shy one and a more outgoing one; only the shy one had a ticket to get into the project. After they started the project they ended up waking up after only few days. They found the castle filled with monsters that killed most of them, leaving only 7 or 8 survivors.
The ones that I remember are the main character (the shy girl), a blond lady, a child (who liked playing with a game), a buff guy, a scientist and an old mean man. The survivors get attacked while trying to get out of the castle and most of them die, leaving the main character and the little boy as the only survivors in the end.