Possible exploit? Not sure if the developer had intended this but use your puckle guns facing INWARD on opposite ends of your fortress. You'll notice the widest part of your field of fire is just on the outside of your walls annihilating the enemy infantry as they engage. It's odd how you're firing thru your fortress and your own men to do so and it makes the game a bit too easy.
This is a fantastic game. It's got lots of replayability and I enjoy experimenting with the best fortress setup. However, it's riddled with bugs the most annoying of which is the game hangs up late in the wave count on Chapparal (sp) screen. I'll come back to it later to see if the dev has bothered to fix the problems.
 "Birdish Petroleum"){kind=icon}
 "Road of the Dead"){kind=icon}
 "GrindQuest Alpha1"){kind=icon}
 "Scene of the Crime: Golden Doll"){kind=icon}
 "Recordshop Tycoon"){kind=icon}
 "Arcane"){kind=icon}
 "Castle Wars 2"){kind=icon}
 "Master of Fortresses"){kind=icon}
 "Dragon Boy"){kind=icon}
 "ACTION TURNIP!!!"){kind=icon}
 "Viricide"){kind=icon}
 "Homerun In Berzerk Land: Berzerk Ball"){kind=icon}
 "I Remain"){kind=icon}
 "4 Differences"){kind=icon}
 "Diesel And Death"){kind=icon}
 "Frontier"){kind=icon}
 "Clockwords: Prelude"){kind=icon}
 "Picma"){kind=icon}
 "The Tickler"){kind=icon}