Anthony, thanks for the empathy about the financial situation.
This one-shot idea that you suggest does sound like an appealing choice! Is there any chance that you might make it an Add-On at the end that includes the associated maps?
I know that you have mentioned other Add-Ons, perhaps yet to be revealed, and this reminds me of the surprises that you had in store for It's Tough To Be A God if the social site posters had cooperated. I know that you're tantalizing us with some Stretch Goals, and sometimes less is more, but having revealed more terrain set art has at least given me an idea of which set I'm picking if I stay at one.
Regarding these Add-On reveals, it might be worth trying to do some bread crumb drops to get some more coverage. You dropped Azalea from your title, and I figured that she was the Fey on your initial splash. As an example of how the bread crumb trail might work for this campaign, however, you could keep her around as a representative mascot character (who could change per project, but as with comic characters, a story begins to develop overtime). You could have her go on an adventure through your worlds as the campaign progresses with snippets of flavor text, introductions of maps, maybe even some little solo combat rules, that helps to engage us backers like you had tried to do with It's Tough To Be A God with the visual map journey, but perhaps in a more interactive way that keeps us participating and involved throughout the process. I have, for example, shared your campaign on Twitter today when I backed, but it's sort of a one-and-done passive affair that gets little attention when I'm backing new projects all the time.
I guess what I'm trying to say is that you want to try to generate an internal excitement that empassions us to walk with you every step of the way. Maybe this will come in a future project. It's just something to think about. Maybe you can tie the terrain competition in with it somehow.
What I further envision is that a cohesive melding of your projects might manifest to build your worlds. As you reveal this terrain competition here, you could even reference a god/dess, hearkening back to It's Tough To Be A God, struggling in determination of which land to create, and then the terrain begins to populate and so on.
These are just some ideas that would make me more excited about the project. Run or fly with them how you wish!