Unfortunately, it feels a bit slow. It takes a large amount of time to wait for the enemies to circle around enough to reach the base, with in which time I could do 3 waves of any other TD. Interesting concept, but only for people with time on their hands.
 "Book of Mages: The Dark Times"){kind=icon}
 "Ether Space Defense"){kind=icon}
 "Bloons Tower Defense 3"){kind=icon}