Minimal Tower Defense is a strategy game where you try to defeat waves of enemies, or Blobs, before they reach your tower. Of course, its less of a tower and more of a redish square on the right side of the screen, but whatever.
Mo' details - http://tristangames.125mb.com/i/mtd.html
Play it - http://tristangames.125mb.com/games/MTD/index.html
I used the open source game Processed Tower Defense to make this game.