Three endings:
1. I haven't actually seen this ending, so I don't know what it is. I just know it exists, and it's really bad.
2. The protagonist dies, at your choice of course, because you made her put the ball of light into a tower and it became the sun. The world is saved. Attempting to start the game again just shows an empty house with light shining in the windows.
3. The protagonist shatters the ball of light and escapes, and the game corrupts itself into being unplayable. Probably a way of saying 'the world died'.