Really quite a poor game, this is a genre that is extremly difficult to do well, essentially this game is either jumping around with a bow and arrow, or charging and clicking with zero skill. Also for the love of god man, the voice acting is painful, talking slow is NOT the same as being dramatic.
Extremely counter intuitive the way that killing people gives you more money than fast victories, it rewards poor play.
Also since the new version I've yet to see an archer kill somebody, I watched my basic spearman run up to 5 archers and kill them one after another.
You want to beat the entire game without thinking, you're invincible when you back jump.
So stand in the corner of the level and back jump, occasionally turn around and back jump into the dead bodies to get more ammo, then just back jump again against the wall. I beat the entire game this way.