It's a voodoo game, the LJN of the modern age. There's no end to the low effort shovelware they plague the app store with. This time we have mob control, a game with usless cannon upgrades, a fake online leaderboard, mechanics that force you to lose or slow your progression, and of course it wouldn't be a proper voodoo game without ads galore. The ads are there to slow the game down and not give you rewards half of the time. Google, please do players a favor and remove voodoo from the app store.