Every monster in the game is weak to certain damage type and deals certain damage type as well. They do Special/Normal damage but it would be cool to have a monster that deals just normal damage and is neutral to every special damage.

There should be Big Shufflebots that do more powerful attacks and maybe some turrets that throw metal parts like Gears, Screws and Stuff. They wouldnt be construct, instead this class could be called Junk or something.