Triple Town is one of my favorite games on iOS over the past few years -- it's a puzzle game with a simple ruleset and a whole lot of complexity. The creators of that game, called Spry Fox, have announced a new title in development called Road Not Taken, and you can now see some concept art from it over on the official blog.
The game is sort of a roguelike, according to the developers, and as you can see above, it has some similarities to the grid-based Triple Town. But instead of building up a world, it's more about finding a path through the world, and avoiding or confr