Defend Your Castle
This game comes highly recommended by fellow RIT classmate, Dave, so you'll have to blame him for it. I'm busy studying for finals, wrapping up a quarter I won't soon miss. So, in the meantime, I'll leave you with Defend Your Castle, an odd and addictive little game of violence against stick figures intent on invading your castle. From what I can glean, the gameplay has some depth by allowing you to purchase additional units and upgrades between levels.