Mech War：Survive until dawn

In the future, robots is attacking the human world，Can you figure out the key to survival？
When night falls, terrifying phantoms emerge. You need to quickly locate an unoccupied room, close the door, and lie on the bed—only by "sleeping" can you accumulate gold coins. Once you have enough gold coins, you can build or upgrade various functional structures, such as doorways and turrets.
As the core defensive facility,doorways can block phantom invasions with their high health points, while turrets take on the offensive role, inflicting damage on phantoms.