Thanks for your feedback!
As mentioned before, we did not get to do any more explanations ingame, and a few game mechanics are rather invisible to the player. I did update the game description to include an explanation on the quests at least.
On the mythical mashup, theres multiple influences here, but we did not have the time to explain these. You've already mentioned rain god worshipping, the shrines originally were supposed to represent a mix of different gods (thor <=> thunder, speed increase <=> Hermes,..), and tower building folklore as well.