Signage, meaning like, the cardboard signs that homeless people hold while begging.
There is the classic "Any bit helps, god bless." then there is the more funny ones like "need money for beer."
I know the feeling about moving on after so much is complete.
My PC is littered with half baked games from the last 15 or so years.
It's a great game concept. I'd encourage you to keep working on it in between projects.
One day your muse may hit you and you'll find whatever that missing piece is that takes it from a game to a GAME. :P
I had one thought about that actually.
Its a game about homelessness, right?
Well, first subtract the negative social commentary.
Second, use it as a "help the homeless" project.
Meaning, you can do a kickstarter, set the goal loooooooow, like $1000.
Then you do this.
Find the homeless community, get them to tell you their "tales from the street."
You'll get an insane amount of creative content to draw from.
Now you have story vignettes for the players to move through (and motivate all of the game mechanics).
So the kick to the kickstarter: 70% goes to the homeless people involved in the game.
Liberals unite to fund game.
Game get's massively overfunded.
Homeless people happy