I find the knights to be mostly useless - perhaps instead of standing directly in front of the tower, they could stand on the right side of the stones so they could at least attempt to engage the archers.
6 does take while to figure out, but if you put the grenades near the tank entry points, barracks at each spawn and a few snipers along the flight paths, it's no problem.
all that time corralling enemies into one group to hit them all with a single shot, I suppose that makes up for starting off weak as a newborn baby each level.
Typical zombie-killing fun! I've been having issues with character movement where it keeps moving me one way all the time. Aside from that bug, it's been a lot of fun for me.
I don't mind looking for minute differences but when you click on the small difference and then find out that you didn't click the correct part of the difference, it's aggravating.
I love the concept, but I encountered a number of issues moving where my character would stop and be non-responsive even though there was nothing obstructing the movement.