A game where the medium badge is harder than the hard! ha! Quick strategy for survival: 1) for spearman, archers, kill them right away with your sword (blocking arrows if necessary). A fast kill on these guys is necessary so you won't get ganged by the swordsmen who always seem to hang out behind the archers and spearmen. 2) for swordsmen, kick them (long-range kicks seem to do the most damage, too) until they have low-ish health and then kill them with sword. If another enemy comes onscreen while you are kicking them, go for the kill with the sword. Two swordsmen together can just about kill you = what you definitely don't want. Hope this helps!
darknut's strategy on purely building a tree maze filled with coals simply does not work. you must combine it with traps that push the pirates back as well. just a heads up.
For the trishot machine gun, upgrade the damage twice, then upgrade the firerate. The reason for this is upgrading damage first is (+100% damage) for 10 points. Upgrading damage again is (+50% damage) for 10 points. Then, if you upgrade firerate five times you get (+100% damage) for 15 points - as opposed to (+33% damage) for 10 points.
wow, beat the campaign, tried to do it again on new game+, computer decided to go into uber high processing speed mode and i couldn't beat level 17. lol :P
phantombk is right upgrade damage first and then rate of fire later, never putting anything in speed. rate of fire is good later in the game after you've gotten like a level 14+ damage stat
besides being harder than getting ALL the impossibles on my computer... nice game :). The only way I can see myself getting the badge is with a computer with slower processing speed :/