Well, technically I played through the tribal stage in day 2, but who really gives a shit? Apparently me?
Anyway, I did blaze through the 3rd stage of evolution, which is the point where your character starts experimenting with fashion. After creating fire and being treated to a whack in the noggin by my own stick, I started building and adding additional accessories all around... ah! While you're making babies and keeping wild animals away from your apples, you can either make music or make war. Once again, I decided to play peacemaker and swoon over the neighboring tribes by going all Rock Band on their ass... well, Rock Band with horns and maracas. There was a hint of Samba de Amigo and Wii Music in that part. Buildings enter the fray, but the types of buildings are limited and there's no customization of these.
I give the tribal stage a partial thumbs-up... dressing up your creature like a gay Roman gladiator is fun, but I just want to fly around in my spaceship and explore.
One last tidbit... I did spend yesterday on just the editing tools and I found myself hooked for a good 3 hours late at night just making the strangest, most elaborate creations I've conceived in a while. And yes, I tried to make some explicit creatures, too.