After playing for a couple weeks now, this game was fun in the very beginning, but as you progress into the game, it is much too hard to progress if not for spending money. If no money is spent, the player will feel he has stagnated and plateaud. The shards are incredibly hard to come by, the chests barely give anything. The pathing of the AI is complete junk, the units can't move diagonally. The reward system for watching the ads barely work, I've watched multiple ads and got nothing in return.