EVEN IF YOU HAVE PLAYED KINGDOM RUSH BEFORE, PLEASE READ THIS! 1) To build a tower, click on the base and follow the directions that come up. 2) Enemies have no health, they die at a single hit from any tower. Different types of enemies are resistant to different types of towers. 3) There are no reinforcements, rain of fire, heroes, or gnome shop items. You probably won't need them anyway. 4) Double-click the green flag or else the game might glitch.
Special thanks to ajba. He made his own version of Kingdom Rush, and I used many of that project's elements in my version. Note: Updated 7/6/20 and removed the glitch where it says "you need more money" even if you don't.