I was playing in "normal" mode and having a heck of a time. Normal should be difficult. Now, I'm playing on sandbox and everything is much more reasonable.
great game and well balanced. only real irritant is the caption that can appear at the bottom of the screen if you run out of money and prevents you from placing a monkey there when you have enough a few seconds later.
it's all pretty easy until you make a few stupid mistakes and get killed. then enemies start piling up on you and you re-spawn right in the middle of them. make the character invincible for a few seconds or put him at a safe distance from the enemies for a notably better player experience.
This is stupid. I have a fighter based strength character and I can't get close enough to my first opponent mage to hit before he zaps me from afar. Too frustrating for me to bother with and this is only the first fight!!
not too difficult if you've been playing defense games. just build a winding maze allowing plenty of coverage for your soldiers. when you can build lots of electric floors and inverted lightning rods everywhere. build a couple of boss guns later on and it's then pretty easy. of course, you can always juggle by removing one of the exit paths and then adding a wall to block their current path.
 "Elite Forces:Defense"){kind=icon}
 "Bloons Tower Defense 3"){kind=icon}
 "Pillage the Village"){kind=icon}
 "Warlords: Heroes"){kind=icon}
 "Swords and Sandals 3: Solo Ultratus"){kind=icon}
 "Whiteboard Tower Defense"){kind=icon}