Bout dam time. Finished. The big guy on 9 clones ur guys onto his side. So, haha, get a way to kill this guy before he gets a move. He's 1200hp and like 75 speed. So put your bonus potions to good use. (btw: bonus potions don't double up.)
Use the value tab to quickly drop the cheapest stuff and make sure you teleport to the next level before you use a scroll to go to the shop. (It levels up the items.)
oh. I explore the maps first before I fight and would use a Deception Scroll to get past the sentry. This gives me all the treasure chests before I fight anybody.
Warning: On the last level is "Yamato" the super huge boss with like 10k life and he fits on half the screen. Not only does he shoot everything at you and kill everything in sight but your tower shots from the fortress do not harm the enemy base until he dies. It could be a bug but it made me nervous for a few minutes...