Howard, I can't say enough how much I hope you come back and put this up for sale in the asset store for Unity.  You would inspire many devs to look into these styles.  The asset you posted a link to earlier, from Kode80 is just nowhere in the ballpark of what you've been doing here.

I hope you're not discouraged or abandoning it.

I've been looking into techniques like this as well, although I'm going more for a style like Hyper Light Drifter where it's more about solid masses of colors, not outlined, and only maybe 2 colors per basic value.