Fun, quick game! It quickly becomes a waiting game once you have enough towers to destroy all leeches in a big wave and a path to force the crawlers down.
I haven't had a non-empty chest yet-- Please fix that. That is my only complaint with this game, otherwise it is 5/5, but 4/5 because of the empty chests.
Perhaps a "simple" mode-- Whatever that means-- for when you have thousands of workers. Maybe dots as workers, or not show them at all, and just the resources? So may ways this game can be an incredible time consumer. 5/5, faved, keep up the good work!
For those frustrated with only level 30+ enemies in the 5-10 area, to level you should just keep resting to fight things like rabid dogs which go from around -10 to 5 and people with crowbars around level 20.