OK game, art is great and you feel strong out the gate but quickly hit a brick wall and progression comes to a screeching halt. Constantly begging for your money. Level up? Here, spend $25-100 for a bundle, pass a new level? Another bundle. Devs asking for $100 for unique units and those are base level, you'd need multiple copies to ascend them to their highest level. Strengthening current units is impossible with low pull rates and large character pools.