@gatherer - it seems to me than when a colony changes hands every enemy tower within it's range is destroyed. Fusterated me to the point of quitting once
blob, wold, skeleton, ogre (i think), some kind of bat creature that looks like a devimon (anybody remembre that?) and tht's as far as i got, tho i shud get another one soon (ithink they change every 15 levels, can anyone clarify that?)