Click the icon on the top right to purchase a tower. Click on the map to place the tower, or you can drag the tower to the bin icon and click it there if you don't want to place it (you can only delete a tower if you haven't placed it yet).
I added more enemy types because Warframe's version of this was to easy. But It is a great game: https://scratch.mit.edu/projects/411210603/ visit warframe on: https://scratch.mit.edu/users/warfame/ sound and music: https://scratch.mit.edu/projects/520147695/ visit him on : https://scratch.mit.edu/users/AhckamSharaf2528/
