This is a "free" game, the constant ads are annoying but you can pay 1 dollar to remove them. So that's the only worthy purchase. The lives reload slowly but it's pretty hard to die so frequently, so no problem with that, also arcade mode is always available. A good addition could be more chest masks. Bad point: there's no way to save progress, the Google play is only used for arcade leaderboards but it won't save your current level on map, not your coins or shields, lost my floor 161 account.