The updates Into The Radius has gone through have actually made it playable. Backpacks work, sleeping bags work, raycasting cursor works, grenades don't randomly lose their pins. Played for about an hour and a half doing three missions before it crashed in the shop while I was reorganising my bullets into new mags. Be careful around the quarry though because the colliders on the ground don't quite match the ground mesh so it's easy to fall in.