New area suggestion
I don't know where this would be on the map but why not have a rainforest style area. We already have a tropical area and a forest area. This area could have a lower tier area and a higher tier area. The lower tier could have monsters like the fire monkey flashlight suggested a while back. The higher tier could have ancient monsters like the ankylosaurus and stegosaurus. It would also probably be home to the alligator suggestion flash had. The ankylosaurs would have defense that exceeds the steel block while still having great strength, and the stegosaurus would have strength exceeding the sentry while of course having great defense.