Booooooring.

It would had been great if you could see like the animals grow, and the tiny people move and make buildings and stuff and advances and see animals on ocean and see different parts of Earth evolving and growing based on how many points you added to the different upgrades. Cause, I just kept upgrading for the only reason of getting more spirits, cause nothing else changes after the upgrade gets to a max limit but you can still upgrade it, but the whole purpose of the upgrade is to get more spirits/per second...