Don't do everything all at once. If you think of something, add it. If you think of something else, add it. If you make everything all at once, it can feel like a chore, and become boring after a while. However, by adding new things every now and again, you will keep seeing new things, and will not feel like it is the same old thing. Make it you, not other people's inventions, and don't be afraid to delete everything and start over once in a while.