Great game. Should be really awesome if some changes could be made.
Energy system : 10min for 1 unit is really too long. It's 3x more than most of the other multiplayer game.
Inventory : most of the mmorpg offer the possibility to purchase inventory slot with coin earn in the game too. And i never see a rpg where the pet and mount takes an inventory slot.
Path finding of the monster : a better one could increase the challenge of the game. It's really easy to use the map design to trap them and safely shoot them from distance.
Maybe you could think to specialise each class in an attribute, all the gears are the same for example warrior gear could offers them more crit, monk, more speed, mage more power.