Interesting, thanks for clarifying.
I realize this is not what you were trying to make, but I would love to see some RPG elements to this game. If you add loot, weapons and enemies, then place these around the map, the player can draw towards it and interact with them.
Perhaps you can only enter certain areas or complete puzzles by using the right terrain.
I don't know, I see a lot of potential in the RPG genre mixed with the world-drawing