The ZBuffer : Serpentine

Homepage, Sandlot games, Microsoft Partner Pack

Serpentine - Do you think you can corral a hungry serpent? Instead of controlling the serpent, use the mouse to manipulate the walls that guide your creatures to yummy "bao" or Chinese steamed buns. Play Serpentine and become the best serpent herder in the land.

According to their system requirements this game uses Managed DirectX. You can download and try the game before you pay.