you can tap and tap again to drop towers (bottom left corner) they will shoot the enemys. DO NOT DRAG THIS CAUSES AN ERROR -----------------------------------------------------------------you get score by beating enemys and lose score by having enemys get to the end - you lose by going under zero score.
still needs more, kinda works at least! i will work on the towers not being able to go on the the track and adding more towers, but, have fun! THERE ARE A LOT OF ERRORS BE CAREFUL----THE LISTS IN THE CODE AREN'T ALWAYS ACCURATE!!! -----------------------------------------------------------------if there is a glitch press the green flag 2 times next (NOT TO FARM VIEWS!!!) it debugs it.