Hi,
So i added ruins of buildings to the surface. I've added a mission to search those ruins. There is a new enemy that defends said ruin mission area. I've also improved the surface monster behavior. Now their vision is much worse, but they can hear and run to the location of your gun shots. This enables to you lure the new enemy away from the ruins or draw distant monsters right too you. So hiding and avoiding the monsters is a viable strategy on the surface, but take care of the shinsuckers as they can sense all around around them. I've also made it so mission objects can be stored in your inventory in your sidearm slots.