I'm still on my first playthrough but disco elysium is a pretty good immersive sim.
it's got items, an inventory grid, your skills matter for everything; closing off and opening paths. there's a slot for bullets (but at this point I'm not sure if that's just to trick you).
it's got a grubby, not-quite-anywhere aesthetic, decayed cities, and the keystone of the immersive sim genre: competing grand conspiracies
