Looks great! I do love simulation games. I've been moving back in that direction again after Dark Souls by playing Shogun 2 (my first Total War game). But this is probably more similar to SpaceChem, or maybe Dwarf Fortress (which I haven't spent as much time on).
I think a good sim game needs a moment where your simulation is tested in some way. I'd criticise, say, RollerCoaster Tycoon for merely being about having x dollars in n time. In Shogun 2 this moment is the Realm Divide, where the current Shogun decides you've become too powerful and unites all the other clans against you. All of a sudden I'm surrounded on all sides by enemy armies. Dwarf Fortress is more of a constant struggle to survive, but Prison Architect will inevitably have riots and escapes, perhaps to the extent of helicopters landing on the roof and soldiers attacking the gates. Looking forward to seeing how far they go with that.