Unsighted is a game where you're actively trying to keep the NPCs alive, but via batteries for robots, so it isn't that very alien to design a farming sim where the people can actually starve. The design space is even wide in that the game may let you be a capitalist, and sell your products in a way that only the richer NPCs may afford it, or you let everyone but your fave die, or you work yourself to death to save everyone. Its nature as a game and as a narrative can coexist, and that depth is what gets players invested.
For urban gardening, I do think it ought to be a minigame side-activity, as "remembering to water your plants" isn't an issue in a "remember to water your plants game," but might actually be a quest in a game with more pressing issues on a clock. Perhaps a mix of Legend of Mana and Atelier series would be the best way to explore it.
Finally, for political statements, I think interesting farming games concepts are being a farmhand, not the inheritor of your grandpa's farm. Maybe even add a bit of genre critique in being the farmhand of the guy that inherited grandpa's farm, and having not just to do your work, but attend the demands of someone who doesn't step in the fields but profits from its boons. (Could be like a VA-11 Hall-A or a Papers Please depending on your touch on it). Another farming issue to possibly address is the situation African farmers go through, with invading companies outlawing the use of their own seeds in their plantations and only allowing the ones they sell to be used for farming. Do illegal farming, some revolution, fight for your rights. It's an industry of struggles, not just cozy vibes, so even if I'm not an enemy of the Harvest Moons and Stardews, there is an issue when all stories told are the same, and variety comes in maybe what you're planting and what NPCs are there to romance.
Great manifesto.


