I intend to make with all this a hack based loosely on Loom, a fantasy videogame of the 80s (if you're not scared by pixel-art games, i reccomend it to you 1000 times).
As i picture it, the big idea of the game is traveling across the world searching for a mystic things known as "patterns" or "drafts", that are the setting equivalent to spells. They're encouraged by their own guilds to catch some of them and thus become full right guild members (maybe a bit like Pokemon). The PCs each represent a guild (weavers, glassmakers, blacksmiths, shepards, assassins, miners, etc) and the civilization is formed by distant city states, and between them, wilderness.
The main conflicts i want to portray is nature: predators, sickness, the weather and natural disasters, scarcity and resource management, and monsters (there are some, too. I plan on having lots of colossus and things built by the "ancients" of the setting). The "patterns" are learnt by directly confronting their sources (surviving a hurricane, for example, lets you attempt to learn the "twisting" pattern. Chasing and finding a white fox on the snow lets you learn the "invisibility" pattern). I want to make gold and encumbrance two important things on the game, and remain important as the PCs level up.
Of course that there will be combat and human foes (every guild is hated by another specific guild), and after all, PCs always know the way of make enemies. But as you see, there is no warrior class among them; they're young students searching for their patterns to graduate, not hacknslashing machines, so i want to portray this; and make them use their lateral thinking and pondering their options always before each combat.
I made a thread for the whole hack in this same forum, too, sorry if i explained too much. Thank you a lot for your comments, they help me a lot putting my thoughts on perspective.