I had been abusing the archer's abilities to hit enemies from a very far distance, and maxing out her Agility stat to do more damage, and favoring items that boost Agility. I'm at about level 35 and on map 35. While in the previous set of levels (21-30) I was able to one-shot enemies, the enemies in this latest set of maps barely get scratched. I had to put the game aside since the last 3 or 4 times I attempted map 35 there has been consistent game-stopping glitches that prevented my character from moving. So I guess my real advice is, wait for some more bug fixes and balance changes, because the game gets much tougher after level 9, and there's still too many bugs.