This is a great game. I've played 4 Kyle Marquis games now and have noticed a pattern. They tend to be very large games with intricate worldbuilding, have high stakes (usually involving the creation or destruction of the world), have a large cast of characters and feature some kind of alternate tech timeline.
In this game, you are in an alternate world where the Byzantium Empire is dominant during what would be Victoria's reign instead of the British Empire. The world features more domes than spires and more bronze and gold than iron and steel.
This world is very different than ours, with explicit Gods and a history numbered in the thousands of years. But an experiment changes everything, plunging you into prehistory.
There, you enter a village where you can play a sort of 'city simulator', deciding to focus on arts or defenses or trading. In the meantime, you have to deal with rival civilizations, some of them non-human, and with the threat of an enormous silver mountain in the sky coming to destroy the world.
The game did feel a bit bogged down in the middle and the climactic battle at my village was over just an action or two faster than I thought it would be, but it was fun. I also had fun investing a lot of relationship time with Vecla when I though she was an old worm before discovering that wasn't the case.
Finally, this is a very long game. Took me well over 2 hours to finish, reading fast, and it is definitely replayable.