My game for this past Ludum Dare is called Island Sandbox, and it's a tile-based sandbox game in which you spawn on a small island. It was supposed to be a survival game, but I ran out of time, so all you can do is place a few blocks (grass, trees, rocks).

View on Ludum Dare: https://ldjam.com/events/ludum-dare/38/island-sandbox

Play on Newgrounds: http://www.newgrounds.com/portal/view/692462

Here is a timelapse of the game development: https://www.youtube.com/embed/FzVodbwF5PA