You play God in an idle game that doesn't have much to it. The only unique aspect of the game is that the two planets (titled One World?) physically evolve as you upgrade them, mostly by use of uninspired geometrical hedrons that emerge from the ocean and land. It is nice to observe the changing of the planets, but what it comes down to in the end is being a poor man's version of Cookie Clicker. Once the additions to the planets become much less noticeable, I lost interest in continuing as I wasn't given much reason to continue.
Perhaps there could have been more strategy actually involved -- too little atmosphere would result in the planet not being able to sustain life very well. Too little plants would result in animals dying, and too little animals would result in humans slowly dying. In order to have prophets, you first need humans, and to have temples, you first need prophets, etc. Failing to ensure life is sustained would show a planet slowly decaying rather than growing healthy. In some ways, the game could be expanded to offer much more variety and incentive in furthering the evolution (or destruction) of a planet and its inhabitants.
As it is, I have hardly any humans, animals, plants, bacteria, and organisms since prophets and temples offer the biggest gain in spirit. These two are really all you need to "beat" the game, and the only reason I continued to allocate spirit into the other choices was to see how it affected the planet's identity. The modifications quickly seized, however; yet there is still plenty of unoccupied land available on both planets. I imagine the humans would eventually become technologically advanced enough to have built spacecraft, for example.
I suppose my influence on the two planets has come to an end, though, as I don't see myself coming back to the game in its current version. The two planets and their well-being is up to the humans now.