Hatch chickens, sell eggs, and promote to the next egg. There are nineteen eggs, from Regular through Rocket Fuel and Quantum to Universe and Enlightenment, and the whole game is the ladder between them. Research, contracts, expeditions, prestige and ascension all sit on their own tabs.
It is openly modelled on Egg Inc and it copies the good part, which is that changing egg resets your production and immediately makes it worth more. The research tree runs eight tiers deep. Expect a few hours and expect the later eggs to want idle time rather than clicks.