i agree with regalwar and dragonarcher there should be pill boxes and towers but made of wrecage and it would maybe take a wave or two to build and you would have to post defenders in them trenches and debris barricades would be good too
bosses are overpowered by the tiem i get one bee out it tKES OVER ALL OF MY TERRITORY THEN I HAVE TO RUN AROUND TRYING TO STRIKE IT DOWN AND A FE W SECONDSL ATER IM DEAD