The Projection Layers are the game's "life system."
Projection layers are a series of protective barriers that protect the subconscious entity while within a person's mind. Should the entity lose all their Mental Health while within the mind, one projection layer will be lost in order to preserve the safety of the mind dweller.
Should the player lose all projection layers, they will be kicked out of the level automatically. If all projection layers are lost while in the real world, the player will respawn to the nearest hub world.