The idea is to deliver the water to the crop plant so it will grow; it's limited because in Hopi country they only get six to ten inches of rain in the course of a year. If you die, the next generation takes over, and as a bonus you get fertilizer from the body. Once the plant is tall enough, you can climb it (up or space on keyboard) up to the breach in the sky and jump through to win.
Complicated, I know, but I have a good feeling about it. Thanks for playing, and I hope that helps!