if you mean the brown trail behind the player it's just a sort of bread crumb and visual effect. The map kind of solves the bread crumb problem though.
Once you get outside of the ring och rocks there are a few golden upgrades to be found, like range, pickup range and initiative, letting you kill the crazy frogs. There are a few puzzlew, and the rest is random rooms of varying difficulty and density. I didn't get as far as i hoped with procedural generation.