R.E.P.O.

R.E.P.O. is an online co-op horror game featuring physics, proximity voice chat and scary monsters. You and up to 5 friends can venture into terrifying environments to extract valuable objects using your physics-based grabbing tool.

Even the monsters are affected by Newton's law of gravity!
Under the employ of a mysterious computer intelligence. It is your job to locate, transport and extract valuable items from the haunted remains of a long lost humanity.