Haven't you always wanted to fly around, destroying creeps and building defenses to survive? Don't let the enemy cars drive pass the finish line. Use your towers to inflict damage on them and watch the sparks fly. This is not the average generic tower defense game. This game requires great multitasking, but is a simple game to start, and hard to master. Enjoy!
Edit: Made the Game Harder for all of the people saying it was to easy. Maybe I can add an insane difficulty if you guys still aren't happy :p