From Hand Drawn Games:
Desktop TD is a fun flash based puzzle / strategy game where you have to protect your desktop from invaders by spending money on attacking pieces and building a maze for them to follow. A strangely addictive yet stress relieving game... how many levels can you survive? For further details on how to play the game see the Instructions. Played before? Check out the latest updates.
What's new in this version: New Scenario, Sandbox, Sprint and Multiplayer modes. New Creeps. New Graphics. Long time coming, but it's finally here. Rejoice.