destroy rather than kill game objects

obj/Area.lua

@@ -40,7 +40,8 @@ function Area:destroy()
     end
     for i = #self.game_objects, 1, -1 do
         local game_object = self.game_objects[i]
-        game_object:kill()
+---@diagnostic disable-next-line: invisible
+        game_object:destroy()
         table.remove(self.game_objects, i)
     end
     self.game_objects = {}