It's so hard to find a game with all the right elements in one place. Three of the most popular elements today in flash gaming (Upgrades, TD, RPG), honestly Bravo! Even mini skill tree's and items! Hard to find fault here, only to say it would be cool to add unique items... I'm an old D2 player and I just love loot!
 "Defender's Quest (lengthy!) Demo"){kind=icon}