Looks like it's pretty much a freemium game anyway. Pay to remove ads IAP as well as a long list of others.
True, but not a true freemium as the highest amount of "z-bucks" buy is 250, and the most expensive "real money for z-bucks" is 3.99, (I think) so IMO that's not much. But yes, it is a lot like a freemium.