I like the idea of slowly growing your army, but once you reach round 3 or 4 suddenly your enemy count explodes to a point where you can't possibly match it once you add up all the numbers. Maybe I'm missing something but it feels like the difficulty far outpaces your growth ability, unless you get lucky with your rolls. At the very least don't charge us coins to see what enemies are coming, that just feels artificially difficult.
It seems fun, but I'm getting frustrated because I feel like I have to constantly restart at a certain (rapidly approaching) point since it feels like I'm hitting an impassable barrier.