Spore is about evolution. Or is it?
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Trade? I have 4 systems within a short range of my home system, each has every planet maxed out and every colony maxed out. Which means I get 30 items of spice very quickly. When I stopped playing(after 2 days) I had a grand total of 90 million.
Terraforming? I have the maxed out cargo bay and have 50 items of each stage for terraforming. If I run out, I can go to any of my planets and just shoot the beam around getting only those that I like
Battle? I have 5 sidekicks, they are useless though since my ship has something like 11000 health, has the shield option that makes it invincible for a few minutes and has maxed out weaponry. Meaning I can take out another home planet(8 colonies) w/o needing to recharge/heal...takes like 30 seconds to hover over a colony, shoot up the main ring of buildings, and then have them surrender with 3 shots at the town hall.
Customization? Sure its fun at first, but it gets boring fast, by the end of it I just went to the database and pulled out old designs.
Alliances? Also boring, I'm down to only needing to do one mission to get a full fledged alliance and there is only like 3 variations there.
Looking back I'd say I spent more time designing the creatures, buildings and units than I did playing the actual game. i.e. I spent more time designing the town hall in the world stage, than I did actually playing it.
(Sean Howard's work is about as close as you'll get to "Game Design design patterns.")