So... I roamed around for a bit to find the key and haven't found anything. So... am I man made in the image of lighthouse?
From what I see in the screenshots, because I couldn't get farther then a good solid roaming about- It is a good-looking game in its simplicity. keep it up. I would either limit how much extra map there is or if the vast land is necessary for a portion of the game, I'd block off a good bit of the map until the key is found.
Good luck!