Tri-Cities Tower Defense Endless

Three of your close allies have been infected. Your goal now is to survive and build defenses along the paths from each city to your own. This is a endless map and will only grow harder as time goes on, soon there will be an endless swarm too large to handle.. How long will you last? If you enjoyed this map please check out some of my other maps as well, I am mainly focused on this style of map creation and have some interesting ideas that I would love feedback for, feel free to add me on steam if you have anything in particular you would like to see!