And here's another Free 2 Play cash cow. Like any 'good' F2P game, the game is playable in the beginning without having to spend money. But, as your leveling progresses you'll soon find you are out of means to buy stuff you really need. That is, unless you're willing to spend huge amounts of money (or grind yourself to death).
Also notice that your 'chance' to win items after battles by choosing slots from a chests dramatically decreases once your are half way the game. Haven't had any item from chests for the last 15 battles...
Could have been much better, but the developer only seems to care to milk the customers.