What a shame honestly they update this game and it ends up being more and more impossible unless you pay to win and even then 200$ doesn't get you far or even the units you want. They made this new upgrade event but the pve scales impossibly and you still get 1 unit here and there while NPC collect 100 it's just a sad cash grab at this point super dissapointed even if you place 20 000$ into this game you still couldn't get far because of how unbalanced it is