Spore devs say the evolution game's previews were more ambitious than what they were actually making, and they 'built a fantasy in people's minds that was unachievable'

The evolution sim that was never meant to be.

PC Gamer
It’s cool, we have Thrive
Have you played it? The main setting of Spore is the Creature Stage. So far, in Thrive, only the microbe stage is available.