Mudcraft for Mac

From The LlamaPad:

Takes place in a whimsical, grassy backyard. A light from above shines down on a mud pit and mud life emerges. At the start of the game, the player has two mud people. The player must direct the mud people to gather dirt and water from around the world and bring it back to the mud pit. Thus, creating more mud people, who in turn can gather additional resources. Each level in Mudcraft has its own goals and objectives, but in general the object of the game is to grow a Mud community.