Getting a chain started is too random and not interactive enough. I can sit there for 20 seconds, not doing a thing while chains fire. Good idea, needs polish.
Game has issues. The only viable tower advancemen path is too ridge. You get random screwed by three mechs appearing at once, you almost always die when that happens.
 "Bloons Monkey City"){kind=icon}
 "Mighty Knight"){kind=icon}
 "10 More Bullets"){kind=icon}
 "Epic Defense"){kind=icon}